Question

0.6g of magnesium is heated in a current of oxygen.what mass of magnesium oxide will remain

Answer 1

\[\color{green}{\text{2Mg} + \text{O}_2 \longrightarrow \text{2MgO}}\]
Find the number of moles of Mg in 0.6 g of Mg. (moles = mass / atomic weight of Mg)
An equivalent number of moles of the product will be formed. They are in a 1:1 ratio in the equation.
Convert the number of moles of product to mass. (Multiply moles by molar mass of magnesium oxide.)