Câu 2 :
a) PTHH : \(2Al+3S-->Al_2S_3\)
\(Zn+S-->ZnS\)
mS = 29,55 - 15,15 = 14,4 (g)
b) nS = 14,4/32 = 0,45 (mol)
PTHH : \(Al_2S_3+3H_2SO_4-->Al_2\left(SO_4\right)_3+3H_2S\)
\(ZnS+H_2SO_4-->ZnSO_4+H_2S\)
\(H_2S+2AgNO_3-->Ag_2S+2HNO_3\)
Bảo toàn S : nAg2S = nH2S = nS = 0,45 (mol)
=> mktAg2S = 111,6 (g)
c) PTHH : \(H_2S+CuCl_2-->CuS+2HCl\)
nH2S = 0,45/2 = 0,225 (mol)
Theo pthh : nCuS = nH2S = 0,225 (mol)
=> mCuS = 0,225.96 = 21,6 (g)