a, \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)
Gọi: Vhh axit = a (l)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=1,5a\left(mol\right)\\n_{H_2SO_4}=0,5a\left(mol\right)\end{matrix}\right.\)
Theo PT: \(n_{Mg}=\dfrac{1}{2}n_{HCl}+n_{H_2SO_4}\) \(\Rightarrow0,2=\dfrac{1}{2}.1,5a+0,5a\)
⇒ a = 0,16 (l) = 160 (ml)
b, Theo PT: \(n_{H_2}=n_{Mg}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)