\(CuO+H_2\underrightarrow{^{to}}Cu+H_2O\)
\(PbO+H_2\underrightarrow{^{to}}Pb+H_2O\)
\(n_{CuO}=\frac{20}{80}=0,25\left(mol\right)\)
\(\Rightarrow n_{H2}=n_{CuO}=0,25\left(mol\right)\)
\(n_{PbO}=\frac{111,5}{223}=0,5\left(mol\right)\Rightarrow n_{H2}=0,5\left(mol\right)\)
\(\Rightarrow\Sigma n_{H2}=0,25+0,5=0,75\left(mol\right)\)
\(\Rightarrow V_{H2}=0,75.22,4=16,8\left(l\right)\)
CuO+H2-to->Cu+H2O
PbO+H2-to->Pb+H2O
nCuO=20\80=0,25 mol
nPbO=111,5\223=0,5 mol
=>VH2=0,75.22,4=16,8l