CuO+H2SO4->CuSO4+H20
Fe+2HCl->FeCl2+H2
2Al+3FeSO4->Al2(SO4)3+3Fe
3Zn+2H3PO4->Zn3(PO4)2+3H2
2Ag+2HCl->2AgCl+H2
2Mn+Pb(NO3)2->2MnNO3+Pb
Ca-CaO-CaCO3-CaO-Ca
2Ca+O2->2CaO
CaO+H2CO3->CaCO3+H2O
CaCO3->CaO+CO2
2CaO->2Ca+O2
ZnSO4
w(Zn)=(65/161)×100%=40.4%
w(S)=(32/161)×100%=19.9%
w(O)=(64/161)×100%=39.7%