12,8g xg
Cu +2 H2SO4 =CuSO4 +SO2 +2 H2O
64g 160g
MCuSO4=64 +32 + 4.16=160------>1mol=160g
x=12, 8 .160 : 64=32 g CuSO4
16g yg
CuO + 2HCl = CuCl2 + H2O
80g 135g
MCuCl2=64 + 3+2.35,5=135------->1mol=135 g ;MCuO=64+16=80
y=16.135 : 80=27 g CuCl2 ----> 1mol=80g