\(2Al+6HCl\rightarrow2AlCl_3+H_2\)
\(\dfrac{m}{27}\) \(\dfrac{m}{54}\) ( mol )
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(\dfrac{m}{56}\) \(\dfrac{m}{56}\) ( mol )
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(\dfrac{m}{65}\) \(\dfrac{m}{65}\) ( mol )
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(\dfrac{m}{24}\) \(\dfrac{m}{24}\) ( mol )
So sánh:
\(\dfrac{m}{24}< \dfrac{m}{54}< \dfrac{m}{56}< \dfrac{m}{65}\)
=> Kim loại Mg cho nhiều H2 nhất