\(m_{tăng}=m_{hh}-m_{H_2\uparrow}=3,96\)
=> \(4,17-m_{H_2\uparrow}=3,96\)
=> \(m_{H_2\uparrow}=0,21\left(g\right)\)
=> \(n_{H_2}=\frac{0,21}{2}=0,105\left(mol\right)\)
Có \(n_{HCl}=2.n_{H_2}=0,21\left(mol\right)\) => \(n_{Cl}=0,21\left(mol\right)\)
=> \(m_{muối}=m_{hh}+m_{Cl}\)
= \(4,17+0,21.35,5=11,625\left(g\right)\)