Can you turn a mole ratio into product mass?
Magnesium burns according to $2\mathrm{Mg} + \mathrm{O_2} \rightarrow 2\mathrm{MgO}$. Calculate the mass of magnesium oxide made from 6.0 g of magnesium. Use $A_r(\mathrm{Mg})=24$ and $M_r(\mathrm{MgO})=40$.