TIH KHOI LUONG BENZEN CAN DUNG DE DIEU CHE 39,25 G BROMBENZEN .BIET HIEU XUAT PHAN UNG DAT 85%
Tính khối lượng axit axetic va ancol etylic can dung de dieu che duoc 6.6 g etyl axetat biet hieu suat phan ung este la 75%
$CH_3COOH + C_2H_5OH \buildrel{{H_2SO_4,t^o}}\over\rightleftharpoons CH_3COOC_2H_5 + H_2O$
$n_{CH_3COOC_2H_5} = \dfrac{6,6}{88} = 0,075(mol)$
$n_{CH_3COOH\ đã\ dùng} = n_{C_2H_5OH\ đã\ dùng} = 0,075 :75\% = 0,1(mol)$
$m_{CH_3COOH} = 0,1.60 = 6(gam)$
$m_{C_2H_5OH} = 0,1.46 =4 ,6(gam)$
de dieu che khi oxi nguoi ta da dung kclo3 nhiet phan
a, viet phuong trinh phan ung tren
b, tinh the tich khi oxi thu duoc ( o dieu kien tieu chuan )khi nhiet phan 73, 5 g kclo3
c tinh khoi luong zno duoc tao thanh khi cho luong khi cho luong khi oxi sinh ra o tren tac dung vs 13 g zn
tinh khoi luong ruou etylic can dung de dieu che 200g dd ch3cooh tren bang phuong phap len men voi hieu suat 80%
de dieu che khi oxi nguoi ta dung kclo3nhiet phan
a, viet phuong trinh phan ung tren
b, tinh the tich khi oxi thu dc ( o dctc ) khi nhiet phan 73,5 g kclo3
c, tinh khoi luong zno duoc tao thanh khi cho luong khi oxi sinh ra o tren tac dung vs 13g zn
a,\(2KClO_3\rightarrow2KCl+3O_2\)
b, \(n_{KClO_3}=m_{KClO_3}:M_{KClO_3}=73,5:\left(39+35,5+3.16\right)=0,6\left(mol\right)\)
THeo PTHH: \(n_{O_2}=\frac{3}{2}n_{KClO_3}=\frac{3}{2}.0,6=0,9\left(mol\right)\)
\(\Rightarrow V_{O_2}=n_{O_2}.22,4=0,9.22,4=20,16\left(l\right)\)
c, \(2Zn+O_2\rightarrow2ZnO\)
\(n_{Zn}=m_{Zn}:M_{Zn}=13:65=0,2\left(mol\right)\)
Theo PTHH: \(n_{ZnO}=n_{Zn}=0,2\left(mol\right)\)
\(\Rightarrow m_{ZnO}=n_{ZnO}.M_{ZnO}=0,2.\left(65+16\right)=16,2\left(g\right)\)
tinh khoi luong AlO2 can dung de san xuat 2,7 tan nhom voi hieu xuat khoang 80%
\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\\ BTNT\left(Al\right):n_{Al_2O_3}.2=n_{Al}\\ \Rightarrow n_{Al_2O_3}=0,05\left(mol\right)\\VìH=80\%\\ \Rightarrow m_{Al_2O_3}=\dfrac{0,05.102}{80\%}=6,375\left(tấn\right)\)
van dung nhung hieu biet ve anh huong cua moi truong doi voi tinh trang so luong va muc phan ung , em hay de xuat mot so bien phap giup nang cao nang suat cay trong va vat nuoi
Cau 1: hoa tan 4g NaOH vao 200ml nuoc. Tinh nong do mol/l cua dd thu duoc. Tinh nong do % cua dd thu dc. Tinh do pH cua dd thu dc. Cho 100ml dd thu dc o tren tac dung voi 100ml dd CuSO4 1M. Tinh k.luong ket tua thu dc
Cau2: dot chay 600g 1 mau than da chua tap chat khong chay thu dc 1met khoi khi CO2(dktc). Tinh % ve k.luong cacbon trong than
Cau3: de dieu che 500g TNT can dung bao nhieu gam toluen biet hieu suat phan ung la 90%
Cau4: cho 6g axit axetit tac dung 1 luong du ancol etilit co H2SO4 dac lm xuc tac. Tinh k.luong este thu dc biet hieu suat la 65%
nung nong m gam hon hop A gom Fe va Fe2O3 voi 1 luong khi CO du, sau phan ung thu duoc 25,2 gam sat. Neu ngam m gam A trong dung dich CuSO4 du thi thu duoc phan ran B co khoi luong la m+2 gam. Hieu suat cac phan ung dat 100%. viet cac phuong trinh phan ung xay ra va tinh% khoi luong cua moi oxit trong hon hop A
Fe2O3 + 3CO -> 2Fe + 3CO2 (1)
Fe + CuSO4 -> FeSO4 + Cu (2)
Đặt nFe=a
Ta có:
mCu-mFe=2
64a-56a=2
=>a=0,25
mFe=56.0,25=14(g)
mFe sinh ra ở 1=25,2-14=11,2(g)
nFe(1)=0,2(mol)
Theo PTHH ta có:
nFe2O3=\(\dfrac{1}{2}\)nFe=0,1(mol)
mFe2O3=160.0,1=16(g)
%mFe=\(\dfrac{14}{14+16}.100\%=46,7\%\)
%mFe2O3=100-46,7=53,3%
mot loai quang boxit chua 85% nhom oxit.de dieu che duoc 1,5 tan nhom can bao nhieu tan quang biet hieu suat cua pu chi dat 60%
\(n_{Al}=\dfrac{1,5.10^6}{27}=\dfrac{1}{18}.10^6\left(mol\right)\)
\(4Al+3O_2\rightarrow2Al_2O_3\)
\(\rightarrow n_{Al_2O_3}=\dfrac{1}{36}.10^6\left(mol\right)\) < lý thuyết >
\(\rightarrow n_{Al_2O_3}=\dfrac{1}{36}.10^6:60\%=\dfrac{5}{108}.10^6\left(mol\right)\)
\(\rightarrow m_{boxit}=\dfrac{5}{108}.10^6:85\%=\dfrac{25}{459}.10^6\left(g\right)\)\(\approx54466\) (tấn)
PTHH: \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
Ta có: \(n_{Al}=\dfrac{1500}{27}=\dfrac{500}{9}\left(kmol\right)\) \(\Rightarrow n_{Al_2O_3}=\dfrac{250}{9}\left(kmol\right)\)
\(\Rightarrow n_{Al_2O_3\left(lýthuyết\right)}=\dfrac{\dfrac{250}{9}}{60\%}=\dfrac{1250}{27}\left(kmol\right)\) \(\Rightarrow m_{Al_2O_3\left(lýthuyết\right)}=\dfrac{1250}{27}\cdot102=\dfrac{42500}{9}\left(kg\right)\)
\(\Rightarrow m_{quặng}=\dfrac{\dfrac{42500}{9}}{85\%}=\dfrac{50000}{9}\left(kg\right)\approx5,56\left(tấn\right)\)