Magnesium is heated in the presence of oxygen to produce magnesium oxide. If you started with 2.43g of magnesium, what is the theoretical yield of magnesium oxide?

4.05g of MgO

Explanation:

Mg + O₂ → MgO

From the equation of reaction,

1 mole of Mg produces 1 mole of MgO

But 1 mole = molar mass

Molar mass of Mg = 24g / mol

Molar mass of MgO = (24+16) = 40g/mol

From the equation of reaction,

24g of Mg reacts to produce 40g of MgO

2.43g of Mg will produce x g of MgO

X = (2.43 * 40) / 24

X = 97.2 / 24 = 4.05g of 4.05g

The theoretical yield of MgO is 4.05g