\(n_{Na}=\dfrac{4,6}{23}=0,2\left(mol\right)\)
\(n_{Ca}=\dfrac{1,2}{40}=0,03\left(mol\right)\)
PT: \(2Na+2H_2O\rightarrow2NaOH+H_2\)
\(Ca+2H_2O\rightarrow Ca\left(OH\right)_2+H_2\)
Theo PT: \(n_{H_2}=\dfrac{1}{2}n_{Na}+n_{Ca}=0,13\left(mol\right)\Rightarrow V_{H_2}=0,13.22,4=2,912\left(l\right)\)