b)
PTHH: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
Theo PTHH: \(n_{H_2SO_4}=n_{H_2}=\dfrac{2,016}{22,4}=0,09\left(mol\right)\)
Theo ĐLBTKL: \(m_{KL}+m_{H_2SO_4}=m_{muối}+m_{H_2}\)
=> m = 4,83 + 0,09.98 - 0,09.2 = 13,47 (g)