Calculate the mass of magnesium oxide, which was obtained by the interaction of 12 grams. magnesium with oxygen.

1. Let’s write the equation of the reaction of magnesium with oxygen:

2Mg + O2 = 2MgO;

2.Calculate the chemical amount of reacting magnesium:

n (Mg) = m (Mg): M (Mg) = 12: 24 = 0.5 mol;

3.According to the reaction equation, the amounts of magnesium and the resulting magnesium oxide are equal to each other:

n (MgO) = n (Mg) = 0.5 mol;

4.Calculate the mass of the oxide:

m (MgO) = n (MgO) * M (MgO);

M (MgO) = 24 + 16 = 40 g / mol;

m (MgO) = 0.5 * 40 = 20 g.

Answer: 20 g.