a) Mg + H2SO4 → MgSO4+H2
b) \(n_{Mg}=n_{MgSO4}=\)\(\dfrac{6}{24}=0.25\)mol
\(C_M=\dfrac{n}{V}=\dfrac{0.25}{0.2}=0.125M\)
\(n_{Mg}=\dfrac{6}{24}=0,25\left(mol\right)\\a, Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\\ b,n_{MgSO_4}=n_{Mg}=0,25\left(mol\right)\\ C_{MddMgSO_4}=\dfrac{0,25}{0,2}=1,25\left(M\right)\)