Explanation:
The formula you will need is the following:
mass (Mg) = n (Mg) x Molar mass (Mg)
If we look at the periodic table, the Molar mass of Magnesium is 24.3g/mol. On the other side, 9.37x10^-3 mol is the same as 0.00937mol. Therefore:
mass (Mg) = 0.00937mol x 24.3g/mol ----> mass (Mg) = 0.227691g
S: The mass of magnesium would be of 2.27691x10^-1g.