2Al + 6HCl → 2AlCl3 + 3H2
a) Theo PT: \(n_{H_2}=\dfrac{3}{2}n_{Al}=\dfrac{3}{2}\times0,2=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,3\times22,4=6,72\left(l\right)\)
b) Theo PT: \(n_{Al}pư=\dfrac{2}{3}n_{H_2}=\dfrac{2}{3}\times0,15=0,1\left(mol\right)\)
\(\Rightarrow H=\dfrac{n_{Al}pư}{n_{Al}}\times100\%=\dfrac{0,1}{0,2}\times100\%=50\%\)