1. Tìm số mol của 6,72 L khí O2 ở nhiệt độ và áp suất tiêu chuẩn.
0,3 mol
3 mol
0,2 mol
2 mol
2. Công thức nào dưới đây là công thức của áp suất?
P = A / F
P = F / A
P = F × A
P = F + A
Đặt vào hai đầu điện trở một điện áp xoay chiều có giá trị hiệu dụng không đổi và tần số f thay đổi được. Khi f = f 0 và f = 2 f 0 thì công suất tiêu thụ của điện trở tương ứng là P 1 và P 2 . Hệ thức nào sau đây đúng?
A . P 2 = 2 P 1
B . P 2 = 0 , 5 P 1
C . P 2 = 4 P 1
D . P 2 = P 1
Đáp án D
Ta có: P = U 2 R nên P không phụ thuộc vào f
Đặt vào hai đầu điện trở một điện áp xoay chiều có giá trị hiệu dụng không đổi và tần số f thay đổi được. Khi f = f 0 và f = 2 f 0 thì công suất tiêu thụ của điện trở tương ứng là P 1 và P 2 . Hệ thức nào sau đây đúng?
A. P 2 = 0 , 5 P 1
B. P 2 = 2 P 1
C. P 2 = P 1
D. P 2 = 4 P 1
Chọn đáp án C
Mạch chỉ chứa R nên khi thay đổi f thì công suất vẫn không thay đổi. Ta có P 1 = P 2
Một đoạn mạch gồm R, L, C nối tiếp, cuộn dây thuần cảm. Đặt vào hai đầu đoạn mạch một điện áp xoay chiều u = U 0 cos 2 πft V với f thay đổi được. Khi f = f 1 = 49 Hz và f = f 2 = 64 Hz thì công suất tiêu thụ của mạch là như nhau P 1 = P 2 . Khi f = f 3 = 56 Hz thì công suất tiêu thụ của mạch là P 3 , khi f = f 4 = 60 Hz thì công suất tiêu thụ của mạch là P 4 . Hệ thức đúng là:
A. P 1 > P 3 .
B. P 2 > P 4 .
C. P 4 > P 3 .
D. P 3 > P 4 .
Đáp án D
+ f 1 và f 2 là hai giá trị của tần số cho cùng công suất tiêu thụ trên mạch
là giá trị của tần số để công suất tiêu thụ trên mạch là cực đại (mạch xảy ra cộng hưởng).
=> P 3 > P 4
Một đoạn mạch gồm R, L, C nối tiếp, cuộn dây thuần cảm. Đặt vào hai đầu đoạn mạch một điện áp xoay chiều u = U 0 cos2πft V với f thay đổi được. Khi f = f 1 = 49 Hz và f = f 2 = 64 Hz thì công suất tiêu thụ của mạch là như nhau P 1 = P 2 . Khi f = f 3 = 56 Hz thì công suất tiêu thụ của mạch là P 3 , khi f = f 4 = 60 Hz thì công suất tiêu thụ của mạch là P 4 . Hệ thức đúng là:
A. P 1 > P 3
B. P 2 > P 4
C. P 4 > P 3
D. P 3 > P 4
Đáp án D
Ta có, giá trị của tần số để công suất tiêu thụ của mạch đạt cực đại là:
Nhận thấy: , thì công suất tiêu thụ của mạch đạt cực đại
, vậy khi
thì công suất tiêu thụ của mạch là P4 và
Một đoạn mạch gồm R, L, C nối tiếp, cuộn dây thuần cảm. Đặt vào hai đầu đoạn mạch một điện áp xoay chiều u = U 0 cos 2 π f t ( V ) với f thay đổi được. Khi f = f 1 = 49 H z và f = f 2 = 64 H z thì công suất tiêu thụ của mạch là như nhau P 1 = P 2 . Khi f = f 3 = 56 H z thì công suất tiêu thụ của mạch là P 3 , khi f = f 4 = 60 H z thì công suất tiêu thụ của mạch là P 4 . Hệ thức đúng là:
A. P 1 > P 3
B. P 2 > P 4
C. P 4 > P 3
D. P 3 > P 4
Đáp án D
Ta có, giá trị của tần số để công suất tiêu thụ của mạch đạt cực đại là: f 0 = f 1 f 2 = 49.64 = 56 H z
Nhận thấy: f 0 = f 3 = 56 H z , thì công suất tiêu thụ của mạch đạt cực đại P max = P 3 , vậy khi f 4 = 60 H z thì công suất tiêu thụ của mạch là P 4 và P 4 < P max = P 3
Một đoạn mạch gồm R, L, C nối tiếp, cuộn dây thuần cảm. Đặt vào hai đầu đoạn mạch một điện áp xoay chiều u = U0cos2πft V với f thay đổi được. Khi f = f1 = 49 Hz và f = f2 = 64 Hz thì công suất tiêu thụ của mạch là như nhau P1 = P2. Khi f = f3 = 56 Hz thì công suất tiêu thụ của mạch là P3, khi f = f4 = 60 Hz thì công suất tiêu thụ của mạch là P4. Hệ thức đúng là:
A. P1> P3
B. P2> P4.
C. P4> P3
D. P3> P4
Đáp án D
+ f1 và f2 là hai giá trị của tần số cho cùng công suất tiêu thụ trên mạch
Hz là giá trị của tần số để công suất tiêu thụ trên mạch là cực đại (mạch xảy ra cộng hưởng).
=> P3 >P4
Biết thể tích của một lượng khí là không đổi. Hãy giải bài toán sau đây bằng hai cách: dùng công thức; dùng đồ thị. Chất khí ở 0 ° C có áp suất 5 atm. Tìm áp suất của khí ở nhiệt độ 273 ° C.
Môn Hóa nha
Đốt cháy hoàn toàn 80 gam pirit sắt trong không khí, thu được chất rắn A và chất khí B. Lượng chất A phản ứng hoàn toàn với 200 gam dd H2SO4 29,4 %( vừa đủ). Khí B trộn với 20,16 lít O2 ở điều kiện tiêu chuẩn , trong bình kín có chất xúc tác ở 400 oC , ap suất la 1atm. sau đó đưa bình về nhiệt độ ban đầu thì áp suất trong bình là 0,8 atm. Độ nguyên chất của pirit sắt là?
la
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cyllysylthreonylalanylthreonylseryllysylarginylalanylalanylprolylvalylisutamylprolylleucylglutamylvalylalanylllphenylalanylthreonylcysteinylglutamyllasparaginylvalylarginylphenylalanylglalanylglycylarginylglutamylisoleucyltyeinylserylisoleucylarginylserylseryllyglutamylisoleucylleucylarginylthreonylylglycylglutamyltyrosylthreonylcysteinyltyrosylglycylserylvalylserylcysteinyylvalylthreonylvalylprolylglycylglycylleucylleucylprolylglutamylarginyllysylutamylvalylvalylleucyllysylserylvalyllmylglutamylglutamylglutamylprolyllysylglutamyllysylvalyllysyllysylprolylalanolylprolyllysylprolylvalylglutamylglutlvalylthreonyllysylarginylglutamylargiylthreonyllysylvalylprolylglutamylisolylleucylprolylalanylprolylglutamylprolnylglutamylvalyllysylthreonylisoleucyllprolylglutamylprolylthreonylprolylisoylvalylprolylvalylvalylglycyllysyllysylyllysylglutamylglutamylalanylalanyllylysylglycylvalylprolyllysyllysylthreonlalanylglutamylarginylarginyllysylleuccylglutamyllysylprolylprolylaspartylglnyltyrosylglutaminylleucyllysylalanylvlyllysylglutamylisoleucyllysylaspartyltamylserylglutamylphenylalanylvalylglylanylglutamylcysteinylleucylvalylserylhreonylthreonyltryptophylmethionyllysyeucylarginylglutamylserylprolyllysylhilanylaspartylglycyllysylaspartylarginycylaspartylvalylglutaminylleucylserylahreonylcysteinylvalylleucylarginylleucylthreonylserylthreonylalanyllysylleucrolylvalylarginylphenylalanylvalyllysyamylvalylthreonylvalylvalyllysylglycylserylcysteinylglutamylleucylasparaginyalyltryptophylarginyllysylaspartylglycysylprolylglycylarginylisoleucylvalylpylmethionylarginylalanylleucylthreonylspartylaspartylthreonylaspartylalanylgreonylvalylglutamylasparaginylalanylasysteinylserylserylcysteinylvalyllysylvnylaspartyltryptophylleucylvalyllysylpinylhistidylvalyllysylprolyllysylglycylalanylcysteinylaspartylisoleucylalanyinylisoleucyllysyltryptophylphenylalanlisoleucylprolylalanylglutamylprolylasmylisoleucylleucylarginylaspartylglycyucyllysylisoleucyllysylasparaginylalanoleucylalanylglutamyltyrosylalanylvalyylarginyltyrosylprolylalanyllysylleucylglutamylvalylglutamylleucylleucyllysyylthreonylisoleucyltyrosylglutamyllysyylaspartylalanylglutamylisoleucylserylylglycylglutaminyltryptophyllysylleucyinylprolylserylprolylthreonylcysteinyllglycylglycyllysylarginylphenylalanyllyllysylleucylaspartylglutaminylalanylgaminylalanylleucylasparaginylalanylisoylleucylthreonylvalyllysylglutamylisolanylalanylvalylprolylleucyllysylaspartrginylarginylglutaminylalanylarginylphcylthreonylarginylglutamylalanylasparaysylglycylprolylaspartylisoleucylisolenylalanylaspartylisoleucylisoleucylalaisoleucylleucylvalylisoleucylasparaginylaspartylaspartylglutamylglycylvalyltutamylglycyllysyllysylthreonylserylalareonylglycylisoleucylarginylleucyllysyucylglutamylaspartylglutaminylthreonyleonylalanylthreonylphenylalanylvalylcylutamyllysylmethionylhistidylvalylvalyinylaspartylalanyllysylleucylhistidyltcylisoleucylserylserylglutamylglycyllymylmethionyllysylglutamylvalylthreonyllglutaminylisoleucyllysylalanylglutamiylthreonylalanylglutaminylleucyllysylvlyltyrosylphenylalanylthreonylvalyllysylalanylvalylglutamyllysylaspartylglutteinylglutamylvalylseryllysylaspartylvlalanyllysylaspartylglycylglutamylglutlysyltyrosylserylisoleucyllysylalanylaoleucylleucyllysylisoleucyllysyllysylaylglycylglutamyltyrosylvalylcysteinylatyllysylthreonyllysylalanylasparaginylinylleucylisoleucylglutamylvalylglutamylglutamylvalylphenylalanylvalylglycyllalanylglutamylisoleucylglutamylleucyltidylglycylglutaminyltryptophyllysylleylthreonylalanylserylprolylaspartylcystamylaspartylglycyllysyllysylhistidyliylasparaginylcysteinylglutaminylleucylylvalylserylphenylalanylglutaminylalanalanylalanylasparaginylleucyllysylvalyleucylphenylalanylisoleucylthreonylproylphenylalanylglutamyllysylaspartylglulcysteinylglutamylvalylserylarginylglularginyltryptophylleucyllysylglycylthreonylglycylaspartylaspartylarginylphenlaspartylglycylthreonyllysylhistidylselalanylalanylphenylalanylglutamylasparnylphenylalanylglutamylalanylglutamylaycyllysylleucylisoleucylisoleucylglutalphenylalanylleucylthreonylprolylleucysylglutamyllysylglutamylserylalanylvalleucylserylhistidylaspartylasparaginyllphenylalanyllysylasparaginylaspartylgnylthreonylarginylserylvalylserylmethillysylthreonylhistidylserylisoleucylthylserylisoleucylaspartylaspartylthreonlylglutamylalanylmethionylglycylmethiocylthreonylvalylleucylglutamylglycylasonylglycyllysylleucylglutaminylaspartylysylaspartylglutamylvalylisoleucylleuucylseryllysylalanylaspartylalanylprolysylaspartylglycyllysylglutamylisoleuclanylvalylisoleucyllysylthreonylasparteucylisoleucylleucyllysyllysylalanylleylglutaminyltyrosylthreonylcysteinylasyllysylthreonylserylglycyllysylleucylainylglutamylisoleucyllysylleucylvalylalglutamylvalylmethionylglutamylthreonylalanylglutamylthreonylglutamylisoleuceucylhistidylalanylasparaginyltryptophnylleucylleucylglutaminylthreonylprolylysylglutamylglutamylglycyllysylisoleustidylasparaginylcysteinylarginylleucyycylvalylaspartylphenylalanylglutaminyerylserylalanylhistidylleucylarginylvaglycylleucylleucylarginylprolylleucyllnylalanylglycylglutamylthreonylalanyltlglutamylleucylseryltyrosylglutamylaspyptophyltyrosylleucyllysylglycyllysyllyllysylvalylvalylprolylarginylserylgluylleucylthreonylleucylarginylaspartylvylglycylglutamylvalylglutaminylleucyltnyllysylthreonylhistidylalanylasparagiamylprolylprolylvalylglutamylphenylalalaspartylglutaminylthreonylvalylglutamlvalylleucylglutamylcysteinylglutamylvalanyllysylvalyllysyltryptophylphenylaglutamylisoleucylleucyllysylseryllysyllanylaspartylglycylarginylvalylarginylpartylcysteinylthreonylprolylglutamylalthreonylcysteinylaspartylalanyllysylaylcysteinylasparaginylleucylasparaginylglutamylphenylalanylleucylarginylprolminylvalylarginylglutamyllysylglutamyllutamylcysteinylglutamylleucylserylargalyllysyltryptophylphenylalanyllysylaslysyllysylglycyllysyllysyltyrosylasparylalanylvalylarginylisoleucylleucylvallleucylleucylaspartylaspartylglutamylalutamylvalylarginylthreonylalanylarginlthreonylvalylleucylglutamylglutamylglyllysylasparaginylleucylalanylasparagimylthreonylaspartylthreonylisoleucyllylseryllysylprolylglycylalanylglutamylvglycylaspartylglutamylglutamylisoleucyinyltyrosylglutamylisoleucylleucylthreylisoleucylleucylvalylisoleucylglutamilutamylaspartylalanylglycylasparaginyleucylprolylserylserylarginylthreonylastidylglutamylleucylalanylalanylglutamylylglutaminylasparaginylleucylglutamylyllysylalanylglutamylphenylalanylvalylutamylserylphenylalanylprolylvalylglutlaspartyllysylthreonylleucylglutamylseylvalylisoleucylalanylaspartylglycyllyllysylaspartylalanylthreonylleucylglutyltyrosylvalylvalylmethionylvalylglycynylhistidylleucylthreonylvalylisoleucylvalylvalylprolylleucyllysylaspartylthaminylglutaminylglutamylvalylvalylphenlvalylasparaginylthreonylglutamylglycyenylalanylarginylasparaginylglutamylglpartylserylseryllysyltyrosylisoleucyliylleucylvalyltyrosylthreonylleucylargistidylleucylaspartylaspartylglutaminylvalylserylleucylthreonylasparaginylhisylvalyllysylserylalanylalanylasparaginmylglutamylaspartylleucylarginylisoleupartylisoleucylglutamylthreonylmethionnylphenylalanyltryptophylcysteinyllysyaginylvalylthreonylleucyllysyltryptophtamylglutamylvalylprolylphenylalanylasyrosylarginylvalylaspartyllysyltyrosyllisoleucyllysylaspartylcysteinylglycyllycylglutamyltyrosylisoleucylvalylthreysylserylvalylalanylglutamylleucylleucrolylthreonylglutamylphenylalanylvalyltylglutaminylthreonylvalylthreonylglutnylvalylphenylalanylserylcysteinylglutylalanylasparaginylvalyllysyltryptophyinylglutamylisoleucyllysylglutamylglyclglutamyllysylaspartylglycylserylisolesoleucyllysylaspartylcysteinylarginyllnylglutamyltyrosylalanylcysteinylglycyerylarginylalanylarginylleucylphenylalrolylvalylglutamylisoleucylisoleucylarisoleucylleucylglutamylalanylprolylglyanylleucylalanylglutamylleucylasparagialylglutaminyltryptophylleucylarginylavalylvalylglutaminylglycylaspartyllysyylserylglutamylglycyllysylisoleucylhisylcysteinylaspartylisoleucyllysylprolytamyltyrosylarginylphenylalanylisoleuclanylarginylalanyllysylleucylglutamyllsoleucyllysylthreonylalanylaspartylglurtylvalylglycyllysylprolylleucylthreonspartylalanyltyrosylprolyllysylalanylgylalanyllysylglutamylasparaginylglutameonylisoleucylaspartylthreonylthreonylylphenylalanylarginylisoleucylleucylglllysylglycylarginyltyrosyllysylisoleucysylhistidylglycyllysylalanylglutamylgylleucyllysylvalylisoleucylaspartylvalaraginylleucylglutamylvalylthreonylgluycylglutamylvalylserylleucylalanyltryphreonylaspartylglycylglycylseryllysylivalylglutamylarginylarginylaspartylisotophylvalylleucylalanylthreonylaspartylglutamylphenylalanylthreonylvalylthreylglycylvalylglutamyltyrosylleucylphennylasparaginylarginylvalylglycylthreonthreonylaspartylasparaginylprolylvalylsylaspartylvalylprolylglycylprolylprolleucylthreonylaspartylvalylasparaginylleucylthreonyltryptophylglutamylprolylglycylalanylglutamylisoleucylthreonylaamylleucylarginylaspartyllysylthreonylrtylthreonylalanylmethionylthreonylvalylserylalanylthreonylvalylthreonylaspanylglutamyltyrosylserylphenylalanylargaraginylarginylisoleucylglycylvalylglyonylprolylphenylalanylvalyllysylvalylalarginylprolylserylprolylprolylvalylaspartylglutaminylthreonylglutaminylseryptophylglutamylprolylprolylleucyllysyleucylleucylglycyltyrosylisoleucylisolelglutamylglycyllysylaspartylasparaginylasparaginylmethionyllysylleucylvalylpysylvalylthreonylglycylleucylglutamyllucyltyrosylarginylvalylserylalanylglutylserylaspartylprolylserylglutamylisolylalanylaspartylaspartylalanylphenylalionylaspartylleucylserylalanylphenylalylvalylisoleucylvalylprolylasparaginylcylvalylprolylserylthreonylglycyltyrosthreonyltryptophylcysteinylphenylalanyamylthreonylglycylaspartylarginylvalylrylalanyltyrosylalanylglutamylleucylvalarginylserylaspartyllysylglycylisoleuglutamylasparaginylarginylvalyllysylthsoleucylaspartylvalylasparaginylvalylinylprolyllysylglutamylleucyllysylphenynyllysylaspartylserylvalylhistidylleucrolylaspartylaspartylaspartylglycylglyyrosylvalylvalylglutamyllysylarginylglltryptophylthreonyllysylvalylmethionylpartylleucylglutamylphenylalanylthreontaminylglycyllysylglutamyltyrosylleucynylarginylasparaginyllysylcysteinylglytyrosylvalylaspartylglutamylprolylvalyrolylalanylthreonylvalylprolylaspartylllysyltryptophylarginylaspartylarginylucylphenylalanylleucylthreonyltryptophnylaspartylglycylglycylserylarginylisolylglutamylarginylcysteinylprolylarginlvalylalanylcysteinylglycylglutamylpromethionylglutamylvalylthreonylglycylletophyltyrosylalanyltyrosylarginylvalylylglutaminylglycylalanylseryllysylprollglutamylisoleucylglutaminylalanylvalyalanylprolylglutamylisoleucylphenylalaucylalanylglycylleucylthreonylvalyllyslglutamylleucylprolylalanylthreonylvalprolyllysylisoleucylthreonyltryptophyllisoleucylleucyllysylglutaminylaspartyucylglutamylasparaginylvalylprolyllysyleucylvalylaspartylseryllysylarginylserosylisoleucylisoleucylglutamylalanylvarginylalanylthreonylalanylvalylvalylgspartyllysylprolylglycylprolylprolylalucylthreonylaspartylvalylthreonylaspareucylthreonyltryptophylasparaginylprolylglycylseryllysylisoleucylthreonylaspginylarginylalanylthreonylaspartylseryylleucylserylserylthreonylvalyllysylasyllysylalanylthreonyllysylleucylisoleurosylisoleucylphenylalanylarginylvalylionyltyrosylglycylalanylglycylglutamyllylisoleucylthreonylalanyllysyltyrosyllprolylglycylprolylprolylthreonylarginisoleucylthreonyllysylaspartylalanylvacysteinylglutamylprolylaspartylaspartyleucylthreonylglycyltyrosyltryptophylvolylaspartylthreonylaspartyllysyltryptyllysylmethionylprolylvalyllysylaspartyllysylglycylleucylthreonylasparaginylalanylarginylvalylleucylalanylglutamylglycyllysylprolylseryllysylserylthreoneucyllysylaspartylprolylisoleucylasparylglycyllysylprolylthreonylvalyllysylalvalylarginylleucylasparaginyltryptophylaspartylglycylglycylalanyllysylisolecylglutamylmethionylleucyllysylthreonytophylvalylarginylvalylalanylglutamylgtaminylhistidylleucylleucylprolylglycyminylglutamyltyrosylserylphenylalanylaginyllysylalanylglycylglutamylserylgluaspartylprolylvalylleucylcysteinylargiprolylserylprolylprolylarginyltryptophaginylisoleucylthreonyllysylasparaginyryptophylthreonylvalylprolylglutamyllysoleucylthreonylasparaginyltyrosylisoltylvalylarginylarginyllysylglycyltryptlthreonylthreonylvalyllysylaspartylthreonylprolylleucylthreonylglutamylglycylarginylvalylalanylalanylglutamylasparylserylaspartyltyrosylthreonylglutamylleucylalanyllysylaspartylthreonylphenyprolylprolyltyrosylalanylleucylalanylvarginylhistidylvalylaspartylleucyllysylasparaginylaspartylglycylglycylarginyrosylvalylisoleucylglutamyllysyllysylgrginyltryptophylvalyllysylalanylglycylrtylcysteinylasparaginylphenylalanylareucylglutamylglycylthreonylglutamylvalalylarginylalanylglutamylasparaginylglylprolylserylglutamylprolylthreonylglulutamylaspartylprolylthreonylserylprolrtylleucylhistidylvalylthreonylaspartyoleucylalanylisoleucylalanyltryptophylaginylglycylglycylserylprolylisoleucylglutamylmethionylcysteinylprolylvalylglmethionylarginylvalylasparaginylserylleucyllysylphenylalanyllysylvalylglutapartyllysylglutamyltyrosylvalylleucylaginylalanylisoleucylglycylvalylserylglerylglutamylasparaginylvalylvalylalanyyllysylprolylthreonylisoleucylaspartyltylisoleucylisoleucylvalylisoleucylgluisoleucylprolylvalylprolylphenylalanylthreonylvalylseryltryptophylhistidyllylysylalanylserylaspartylarginylleucyltartylhistidylisoleucylserylalanylhistirylvalylarginylalanylaspartylalanylglylthreonylleucylglutamylasparaginyllysynylserylisoleucylasparaginylvalyllysylcylprolylcysteinyllysylaspartylisoleucthreonyllysylserylserylcysteinyllysyllylprolylglutamylphenylalanylaspartylglucylhistidyltyrosylvalylleucylglutamylrginylarginylthreonyltyrosylisoleucylpmylasparaginyllysylleucylseryltryptophsoleucylprolylasparaginylglycylglutamyinylvalyllysylalanylvalylasparaginyllyyrosylisoleucylglutamylleucyllysylaspautaminylaspartylprolyllysylglutaminylplaspartylvalylglutamylvalylhistidylasplalanylmethionylthreonylisoleucylthreoltyrosylaspartylglycylglycylseryllysyleucylisoleucylglutamyllysylisoleucylalnyltryptophyllysylarginylcysteinylasparolylisoleucylleucylthreonyltyrosylthrlglutamylglycyllysylglutamyltyrosylglunylalanylglutamylasparaginylalanylalanlserylarginylalanylthreonylprolylprolyolylisoleucylaspartylalanylprolyllysylserylleucylglutamylvalyllysylarginylglleucylaspartylalanylserylisoleucylseryonylisoleucylthreonyltryptophylisoleucalylisoleucylvalylprolylglutamylglutamlanylprolylleucylvalylarginylarginylarinylglutamylglutamylglutamylprolylphenonylglutaminylarginylleucylserylisoleuylglycylglutamylserylglutaminylleucylaylarginylprolylaspartylhistidylglycyllvalylglutamylasparaginylaspartylhistidrolylcysteinylthreonylvalylserylvalyllolylprolylisoleucylasparaginylphenylalylisoleucylarginyllysylthreonylserylvautamylprolylprolylleucylaspartylaspartlisoleucylasparaginyltyrosylthreonyllethreonyllysylprolylaspartylserylglutamonylserylthreonylleucylarginylhistidylonyllysylleucylisoleucylglutamylglycylnylarginylvalylarginylalanylglutamylasrolylglycylprolylprolylcysteinylvalylsylaspartylprolylphenylalanylglycylprolllysylprolylisoleucylvalylglutamylasparylmethionylleucylvalyllysyltryptophyltylasparaginylglycylserylprolylisoleucylglutamyllysylarginylglutamylvalylaspphylserylarginylvalylasparaginyllysylsucyllysylalanylasparaginylvalylaspartyucylthreonyltyrosylvalylphenylalanylarparaginylalanylalanylglycylprolylglycyserylaspartylprolyllysylthreonylalanyllprolylprolylglycylprolylprolylisoleuclthreonylserylserylthreonylthreonylisohylglutamylprolylprolylalanylphenylalatamylisoleucylvalylglycyltyrosylphenyleucylvalylglycylthreonylasparaginyllysreonylglutamyllysylmethionylisoleucyllreonylvalyllysylglutamylisoleucylarginyllysylleucylarginylvalylserylalanylvatamylglycylprolylprolylglycylglutamyltlvalylalanylglutamylprolylglutaminylglylleucylaspartylvalylserylvalyllysylglcylmethionylalanylglycyllysylthreonylllylvalylthreonylglycylarginylprolylvallthreonyllysylglutamylglutamylglycylglginylvalylvalylisoleucylaspartylasparalutamylleucylisoleucylisoleucyllysylastylhistidylglycylarginyltyrosylvalylisginylserylcysteinylglycylseryllysylphealylglutamylvalylphenylalanylaspartylvpartylleucyllysylprolylvalylvalylthreocysteinylleucylleucylasparaginyltryptortylaspartylglycylglycylserylglutamylisoleucylisoleucylglutamylarginyllysylathreonyltryptophylarginylglutaminylprolarginylseryllysylcysteinylaspartylisotamylglycylglutaminylglutamyltyrosyllylalanyllysylasparaginyllysylphenylalanvalylglutamylisoleucylglycylprolylisollleucylglycylprolylprolylthreonylseryltyrosylthreonylglutamylarginylglutaminonylleucylaspartyltryptophyllysylglutacylglycylserylprolylisoleucylglutaminytamyllysylarginylarginylhistidylaspartutamylarginylvalylasparaginyllysylargieonylserylphenylalanylleucylvalylglutalhistidylglutaminylmethionyltyrosylglulanylvalylasparaginylglutamylisoleucylrylleucylprolylleucylasparaginylvalylvrtylglutamylvalylprolylprolylthreonyliylvalylarginylglycylaspartylthreonylislutamylprolylvalylhistidylisoleucylprolleucylprolylmethionylprolyllysylisolearaginylglutamylthreonylvalylisoleucylalanylleucylglutaminylisoleucylthreonyinylserylglutamylalanyllysylthreonylglylalanylvalylarginylglutamylaspartyllyylthreonylalanylserylasparaginylarginyarginylasparaginylvalylhistidylvalylglolylserylprolylprolylarginylasparaginysoleucyllysylalanylglutamylserylcysteispartylalanylprolylleucylaspartylaspareucylthreonylhistidyltyrosylvalylisolenylserylarginyllysyllysylalanylglutamyeonylasparaginylthreonylalanylvalylgluucyltryptophyllysylleucylisoleucylprollglutamylphenylalanylarginylvalylarginlglycylisoleucylserylaspartylglutamylclvalylisoleucylglutaminylaspartylprolyolylprolylglycyllysylprolyllysylvalyllylserylmethionylleucylvalylseryltryptotylasparaginylglycylglycylserylprolyliphylleucylglutamyllysylarginylglutamylptophylserylarginylvalylserylarginylalylglycylleucyllysylglycylvalylglutamylrginylleucylleucylglutamylglycylvalyllginylalanylmethionylalanylisoleucylaspglycylprolylprolylserylglutamylprolylsylglycylaspartylprolylisoleucylphenylaserylcysteinylprolylglutamylvalyllysyllisoleucylserylleucylglycyltryptophyllglycylglycylserylprolylisoleucyllysylgethionylglutaminylglutamylglutamylglycllysylarginylvalylasparaginylglutamylpreonylthreonylcysteinylglutamylcysteinlysylglutamylleucylarginyllysyltyrosyllalanylvalylasparaginylglutamylalanylgylaspartylthreonylthreonylglycylglutamrtylisoleucylglutaminylglutamylglutamyleucylaspartylisoleucylglycylalanylglucysteinyllysylalanylglycylserylglutamilanylvalylisoleucyllysylglycylarginylpryptophylglutamylphenylalanylaspartylghionyllysylaspartylglycylvalylhistidylrtylalanylglutaminylleucylglutamylthreerylvalylisoleucylisoleucylisoleucylprrylhistidylthreonylglycyllysyltyrosylsaraginyllysylalanylglycylglutaminyllyslarginylvalyllysylvalylmethionylaspartlaspartylleucyllysylvalylserylaspartylcysteinylarginylleucylseryltryptophyllaspartylglycylglycylaspartylarginylisocylglutamyllysylarginylthreonylisoleucylthreonyllysylvalylasparaginylprolylathreonylphenylalanylvalylvalylprolylasaminylglutaminyltyrosylphenylalanylphelutamylasparaginylarginylphenylalanylgylglutamylthreonylisoleucylglutaminylaaspartylprolylisoleucyltyrosylprolylprsylleucyllysylisoleucylglycylleucylisonylvalylhistidylleucylseryltryptophyllartylglycylglycylserylprolylvalylthreotamylcysteinylleucylalanyltryptophylasysyllysylglutamylalanyltryptophylarginylarginylaspartylvalylglutamylglutamyllvalylglutamylaspartylleucylvalylglutamylphenylalanylarginylvalyllysylalanylalylseryllysylprolylserylalanylthreonycysteinylglutaminylarginylprolylaspartylaspartylleucyllysylglutamylphenylalautamylglycylthreonylasparaginylvalylassoleucyllysylglycylvalylprolylphenylalptophylphenylalanyllysylalanylprolylprinyllysylglutamylprolylvalylleucyltyroaraginyllysylleucylvalylvalylaspartylacylvalylisoleucylprolylglutaminylserylglycylleucyltyrosylthreonylisoleucylthinylleucylglycylthreonylalanylseryllysaraginylvalylleucylglycylarginylprolylisoleucyllysylphenylalanylglutamylserymethionylthreonylleucylseryltryptophylylaspartylglycylglycylseryllysylisoleusoleucylglutamyllysylarginylglutamylaltryptophylvalylhistidylvalylserylseryllthreonyltyrosylthreonylisoleucylprolytidylglutamyltyrosylvalylphenylalanylaminylasparaginyllysyltyrosylglycylisolrtylserylglutamylprolylglutamylthreonyylalanylserylvalylprolylglycylalanylprlserylserylvalylthreonylarginylasparagraginyltryptophylglutamylglutamylprolylserylprolylvalylthreonylglycyltyrosylsylaspartylthreonylthreonylseryllysylaparaginylarginylaspartylprolylisoleucyglycylvalylseryltyrosyllysylvalylthreocylserylaspartyltyrosylglutaminylphenyleucylasparaginylalanylalanylglycylvalylserylaspartylprolylalanylthreonylalaanylprolylprolylglycylprolylprolylphenartyltryptophylthreonyllysylserylserylhylserylprolylprolylleucyllysylaspartylglycyltyrosylisoleucylvalylglutamyltyylglutamylglutamyltryptophylglutamyllyvalylarginylglycylthreonyllysylleucylvlutamylglycylalanylphenylalanyltyrosyllanylvalylasparaginylisoleucylalanylglycylglutamylvalylthreonylaspartylvalylrtylarginylleucylvalylserylprolylasparanylserylvalylarginylaspartylarginylisylglycylvalylisoleucylarginylisoleucylcyllysylprolylprolylprolylthreonylvalyonylasparaginylglutamylarginylthreonyllthreonylisoleucylglutamylthreonylthreethionylvalylisoleucyllysylasparaginylidylglutaminylglycylvalyltyrosylseryllutamylalanylglycylglutamylarginyllysyllaspartylvalylleucylaspartylvalylprolylylphenylalanylleucylalanylhistidylasputamylserylcysteinyllysylleucylthreonylutamylaspartylaspartylglycylglycylserltyrosylvalylisoleucylglutamyllysylarginylalanyltryptophylthreonylprolylvalyylarginylglutaminylasparaginylalanyltholeucylglutaminylglycyllysylalanyltyrosoleucylalanylalanylglutamylasparaginylprolylphenylalanylvalylglutamylthreonleucylarginylglutamylprolylisoleucylthlylglutamylaspartylleucylglutamylvalylraginylthreonylvalylthreonylleucylthreyllysyltyrosylaspartylglycylglycylserynyltyrosylvalylleucylglutamylserylargitamyllysylphenylalanylhistidyllysylvalginylleucylleucylserylarginyllysyltyrosylglutamylglycylaspartylthreonyltyroslanylvalylasparaginylisoleucylvalylglyphenylalanylcysteinylthreonyllysylprolpartylglutamylleucylalanylprolylprolyllphenylalanylarginylaspartyllysylleucylglutamylalanylphenylalanylalanylleucylycyllysylprolyllysylprolyllysylvalylsrtylglutamylalanylaspartylvalylleucylgnylhistidylisoleucyllysylthreonylthreoleucylglutamyllysylisoleucyllysylalanyyllysyltyrosylcysteinylvalylvalylvalylcylserylarginyllysylglycylphenylalanylvalylvalylaspartylhistidylprolylglycylerylphenylalanylaspartylglutamylvalyltlvalylisoleucylseryltryptophyllysylproylglycylseryllysylisoleucylthreonylasputamyllysyllysylglutamylvalylglycyllysrolylvalylthreonylserylalanylserylalanylvalylseryllysylleucylleucylglutamylghenylalanylarginylisoleucylhistidylalaglycylisoleucylserylaspartylprolylleucysylalanyllysylaspartylarginylphenylallprolylaspartylglutaminylprolylisoleucllysylaspartylserylalanylleucylvalylthlylhistidylaspartylglycylglycyllysylprosylisoleucylleucylglutamyllysylarginylarginyltryptophylalanylarginylvalylthistidylprolyltyrosylthreonyllysylphenyucylleucylglutamylglycylcysteinylglutainylvalylserylalanylglutamylasparaginyycylaspartylprolylserylprolylprolylserllysylaspartylprolylisoleucylalanyllysaginylprolylglutamylalanylisoleucylaspaginylserylvalylaspartylleucylthreonylinylhistidylaspartylglycylglycylseryllleucylvalylglutamyltyrosylglutaminyllymyltryptophylarginylarginylalanylasparlserylcysteinylprolylglutamylthreonyllleucylarginylaspartylglycylglutaminyltnylvalylleucylalanylvalylasparaginylalylprolylalanylhistidylvalylprolylglutatylarginylleucylglutamylprolylprolylglalanylasparaginylmethionylalanylarginyllysylvalylglycylaspartylthreonylleucysoleucyllysylglycylvalylprolylphenylalhyllysyllysylglutamylaspartylarginylasylarginylisoleucylaspartylvalylthreonylutamylisoleucylarginylasparaginylalancylglycylisoleucyltyrosylserylleucylthlalanylglycylseryllysylthreonylvalylseaspartyllysylprolylglycylprolylprolylarylglutamylisoleucylarginyllysylaspartyltryptophyllysylglutamylprolylleucylaylisoleucylthreonylasparaginyltyrosylvrtylvalylalanylserylalanylglutaminyltrlthreonylseryllysyllysyllysylserylhistleucylasparaginylglutamylglycylasparaganylarginylvalylalanylalanylglutamylasinylglycylprolylphenylalanylvalylglutayllysylalanylleucylaspartylprolylleucyolyllysylaspartylleucylhistidylhistidyeonylglutamylvalylserylleucylvalyltryplarginylaspartylglycylglycylserylprolyylvalylglutamyltyrosylglutaminylglutamspartyltryptophylisoleucyllysylphenylaraginylleucylglutamylcysteinylvalylvaltaminylglycyllysylthreonyltyrosylarginylglutamylasparaginylisoleucylvalylglythreonylthreonylisoleucylprolylisoleucyllysylleucylvalylprolylprolylserylvaleucylisoleucylglutamylglycylleucylvalyonylvalylarginylphenylalanylprolylalanlylprolylvalylprolylthreonylalanyllysyglycylserylglutamylisoleucyllysylthreohreonylvalylglutamylthreonylaspartylaslleucylthreonylisoleucyllysylasparaginrtylthreonylglycylglutamyltyrosylglutaaraginylalanylalanylglycylseryllysylthlthreonylvalylleucylaspartylvalylprolyolylisoleucylasparaginylisoleucylleucylhistidylmethionylthreonylisoleucylserysylaspartylaspartylglycylglycylserylpylisoleucylvalylglutamyllysylglutaminyylthreonyltryptophylglycylvalylvalylseyllysylleucyllysylisoleucylprolylhistiinylglutamyltyrosylvalylphenylalanylarraginyllysylisoleucylglycylvalylglycylonylprolylthreonylvalylalanyllysylhistlylserylprolylprolylglycyllysylprolylvhreonylglutamylasparaginylalanylalanyllleucylprolyllysylserylaspartylglycylgycyltyrosyltyrosylmethionylglutamylargcyllysyltryptophylvalylarginylvalylasplalanylaspartylleucyllysylphenylalanylosylglutamylglycylasparaginylthreonyltlylphenylalanylalanylglutamylasparaginlprolylserylprolylserylserylaspartylprginylprolylisoleucyllysylprolylprolylgylprolyllysylleucyllysylaspartyllysylspartylleucylvalyltryptophylthreonyllysycylserylprolylisoleucylleucylglycyltytaminyllysylprolylglycylthreonylalanylnylisoleucylasparaginyllysylaspartylglnylcysteinylalanylphenylalanylarginylvamylglycylasparaginylglutamyltyrosylarsylalanylalanylasparaginylisoleucylvallarginylglutamylleucylalanylglutamylselisoleucylleucylhistidylprolylprolylgllylthreonylcysteinylarginylaspartylvallglycylglutaminylthreonylisoleucylargillysylglycylarginylprolylglutamylprolylthreonyllysylglutamylglycyllysylvalylnylvalylaspartylleucylisoleucylglutamiglutamylleucylglutaminylisoleucyllysylartylhistidylglycyllysyltyrosylisoleucnylserylserylglycylhistidylalanylglutalasparaginylvalylleucylaspartylarginylylasparaginylleucyllysylvalylthreonylalasparaginylcysteinylthreonylisoleucylrolylleucylaspartylasparaginylglycylglsparaginylphenylalanylisoleucylvalylglraginylglutaminyllysylglycyltryptophyltylvalylthreonyllysylarginylleucylisolucylalanylasparaginylasparaginylglutamvalylcysteinylalanylglutamylasparaginyhreonylisoleucylglutamylthreonyllysyltsoleucylasparaginylprolylisoleucylaspaylglutamylasparaginylleucylhistidylisolthreonylphenylalanylvalyltyrosylleucylaspartyltyrosylaspartylglycylglycylsesylhistidylvalylglutamylarginylarginyltyltryptophylglutamylarginylvalylhistiutamylthreonylhistidyltyrosylmethionyllutamylasparaginylglutaminylisoleucyltlylglutaminylthreonyllysylasparaginylgartyltryptophylvalyllysylthreonylglutaamylaspartylleucylglutaminyllysylprolyylserylglycylvalylleucylthreonylvalyllleucylarginylleucylglutamylalanylglycylalanylprolylglutamylvalylalanyltryptotylalanylthreonylaspartylleucylthreonylisoleucylaspartylthreonylarginylalanylserylleucylthreonyllysylalanyllysylartyrosylvalylvalylthreonylalanylthreonyylphenylalanylvalylalanyltyrosylalanylaspartyllysylprolylglycylprolylvalylarlvalylaspartylvalylserylserylaspartylayltryptophylaspartylprolylprolylglutaminylglutamylisoleucylglutaminylasparagysylcysteinylglutamylthreonyllysylargieonyltyrosylserylalanylthreonylvalylleeonylvalylthreonyla
Trong một bình kín chứa hơi chất hữu cơ X (có dạng CnH2nO2) mạch hở và khí O2 (số mol O2 gấp đôi số mol cần cho phản ứng cháy) ở 139,9°C, áp suất trong bình là 0,8 atm. Đốt cháy hoàn toàn chất X sau đó đưa về nhiệt độ ban đầu, áp suất trong bình lúc này là 0,95 atm.
Chất X có công thức phân tử là:
A. C2H4O2
B. CH2O2
C. C4H8O2
D. C3H6O2
Đáp án D
phản ứng cháy
Với bài này, thông thường các bạn thường nghĩ tới tính được tổng số mol khí trước và sau phản ứng, tuy nhiên với dữ kiện giả thiết không đủ cho ta tính các số liệu trên trên.
Mà với tổng số mol khí trước phản ứng bất kì, trong điều kiện bình kín không thay đổi và nhiệt độ trước và sau phản ứng như nhau thì ta luôn có:
Do đó để cho đơn giản, ta chọn 1 mol CnH2nO2 ban đầu, khi đó:
⇔ n=3
Vậy X là C3H6O2.