a: \(n_{H_2}=\dfrac{10.08}{22.4}=0.45\left(mol\right)\)
\(m_{H_2}=0.45\cdot2=0.9\)
b: \(n_{N_2O}=\dfrac{5.376}{22.4}=0.24\left(mol\right)\)
\(m_{N_2O}=0.24\cdot\left(14+16\right)=0.24\cdot30=7.2\)
c: \(n_{CO}=\dfrac{20.16}{22.4}=0.9\)
\(m_{CO}=0.9\cdot28=25.2\left(g\right)\)