ta co pthh na + h2O -> na2O + h2 ( dknđ)
pt 2 2 Fe + 3 h2O -> fe203 +3 h2
theo de bai ta co nH2 = 1.5/22.4= 0.07 mol
goi x la so mol cua H2 tham gia vao pt 1
so mol H2 tham gia vao pt 2 la 0.07-x mol
ta co pthh na + h2O -> na2O + h2 ( dknđ)
pt 2 2 Fe + 3 h2O -> fe203 +3 h2
theo de bai ta co nH2 = 1.5/22.4= 0.07 mol
goi x la so mol cua H2 tham gia vao pt 1
so mol H2 tham gia vao pt 2 la 0.07-x mol
mot hon hop gom 2 kim loai Na va Fe .
Neu cho hon hop nay vao nuoc du thi thay thoat ra V lit khi , con neu dem cung khoi hon hop do vao dd HCl du thay thoat ra 1,5 V lit khi .
- xac dinh % ve khoi luong cua 2 kim loai trong moi hon hop
( giup em voi mai em phai nap bai rui . huhu)
bai 1: cho 2,35(g) Zn vao 100ml dung dich HCl 0,5M thu duoc chat khi A. cho luong khi A noi tren di qua ong dung Cuo du, nung nong. -tinh khoi luong Cu tao ra Bai 2: cho 8 gam hon hop 2 kim loai Mg, Zn vao 200ml ddHCl khi phan ung ket thuc thi thu duoc 3,36 (l) khi (dktc) neu them tiep luong ddH2SO4 loang du vao thi thay thoat ra them 1,12(l) khi(dktc) a,xac dinh khoi luong cua moi kim loai trong hon hop tren ? b, tinh Cm cua ddHCl o tren? ( moi ngui oi giup mik voi chieu minh phai lam bai rui.ai bt giup mik cai nha!)
X la hon hop gom Mg va Zn.Y la dd H2SO4 chua ro nong do.
Thi nghiem 1:Cho 24,3 g X vao 2 l dd Y thu duoc 8,96 l H2
Rhi nghiem 2:Cho 24,3 g X vao 3 l dd Y thu duoc 11,2 l H2
Chung to rang trong TN1 X chua tan het con trong TN2 X tan het
Tinh nong do mol cua dd Y va khoi luong cac kim loai co trong X
cho mau kim loai bari vao nuoc thay thoat ra 2,24 lit khi o dieu kien tieu chuan
tinh khoi luong cac chat trong phan ung
cho 10.2 g hon hop gom al va mg vao dung dich hcl du sau khi phan ung ket thuc thi thu duoc 11.2 lit khi (đktc)
Cau 1: cho 4,8(g) magie tac dung voi HCl thi thu duoc 2,24(l) khi hidro(dktc) a, CMR: Mg du con HCl het. b,tim khoi luong cua Mg du, va MgCl2 tao thanh sau phan ung Cau 2:cho 10,8(l) khi Cl (dktc) tac dung voi m(g)Cu. Sau phan ung thu duoc 63,9(g) chat ran a, Chat nao phan ung het, chat nao con du? b,tinh m va phan tram khoi luong cac chat sau phan ung. Cau 3: Dot chay 16g luu huynh thi thu duoc 8,96(l) khi a, CMR luu huynh du b, tinh the tich oxi tham gia vao phan ung Cau 4: cho 5,4g nhom tac dung het voi HCl hon hop thu duoc sau phan ung hoa tan duoc tiep voi m"(g)Mg va thu duoc 2,24(l) khi H2 o dktc . Tim m va m" Cau 5: Cho 8g NaOH tac dung voi m(g) H2SO4. Sau phan ung luong axit con du tac dung vua du voi 11,22g sat: so do phan ung la: NaOH + H2SO4 ->Na2SO4 + H2O a, tinh m b,tinh the tich khi hidro sinh ra o dktc (MOI NGUOI GIUP EM VOI A < MAI EM PHAI NAP BAI ROI)
gup em voi nek
CAU 1: cho 6(g) Ca vao 73(g) dd HCl 10%, sau phan ung thay thoat ra V lit kkhi o dktc
a, tim V
b, neu dan luong khi noi tren di qua ong dung n(g) Cu co nung nong , ket thuc phan ung co 10(g) chat ran con lai . tim m?
( giup em voi anh chi oi )
cau 1: cho 3,2 g Cu tac dung voi V lit khi O2, sau phan ung thi O2 con du . luong O2 con du nay tac dung vua du voi 11,2 g sat. Tinh V CAu2: dot chay hoan toan 16g canxi . Cho chat ran sau phan ung tac dung voi 18, 25g axit HCl. Tinh khoi luong cac chat con lai sau phan ung : CaO +HCl -> CaCl2 +H2O
( giup mik voi chieu mik lam bai rui _huhu)
CAU 1:cho 5,4(g) nhom tac dung het voi HCl , hon hop thu dc sau phan ung hoa tan duoc tiep voi m"(g) Mg, va thu duoc 2,24(l) khi H2 o dktc . Tim m va m" CAU 2: cho 8g NaOH tac dung voi m(g) H2SO4. sau phan ung luong axit con dutac dung vua du voi 12g sat. So do phan ung: NaOH +H2SO4 -> Na2SO4 + H2O a, tinh m. b, tinh the tich khi hidro sinh ra o dktc