Răspuns:
m=1620g CuO
mCu=?
CuO + H2 => Cu + H2O
MCuO =64+16=80g/mol
MH2=2×1=2g/mol
MCu=64g/mol
MH2O =2×1+16=18g/mol
1 mol CuO + 1 mol H2 => 1 mol + 1 mol H2O
80g CuO + 2gH2 => 64g + 18g H2O
80g.......................64g
CuO + H2 => Cu + H2O
1620g....................xg Cu
x=1620×64/80= calculează
