Suzi Nguyễn's

2 năm trước

1/ Hòa tan 21,1(g) hỗn hợp A gồm Zn và ZnO bằng 200(g) dd HCl (vừa đủ) thiu được dd B và 4,48(l) khí H2 a - Xác định khối lượng mỗi chất có trong hỗn hợp A b - Tính C% của dd HCl đã dùng c - Tính khối lượng muối có trong dd B 2/ Cho 15,75 hỗn hợp hai kim loại Cu và Zn vào H2SO4 loãng dư, thu được 33,6(l) khí (đktc) a - Tính khối lượng mỗi kim loại trong hỗn hợp đầu b - Tính khối lượng dd muối thu được.

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thanhphongbuoi

2 năm trước

Đáp án:

Giải thích các bước giải:

Zn+2HCl→ZnCl2+H2

0.2 ←0.4 ←0.2←0.2(mol)

ZnO+2HCl→ZnCl2+H2O

0.1→0.2→0.1 (mol)

nH2=4.48/22.4=0.2(mol)

mZn=0.2*65=13(g)

mZnO=21.1-13=8.1(g)

nZnO=8.1/810.1(mol)

C% HCl=0.2*36.5+0.4*36.5/200*100=10.95%

mMuối=0.2*136+0.1*136=40.8(g)

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