Question

Write the balanced chemical equation for the formation of magnesium oxide from magnesium and elemental oxygen. 1. Write the balanced chemical equation for the formation of magnesium nitride from magnesium and elemental nitrogen. 2. Write the balanced chemical equation for the conversion of magnesium nitride to magnesium oxide as performed in steps 7-8 in the procedure. The reaction produces magnesium oxide and ammonia (NH,). 3. If some of the product contained magnesium nitride rather than magnesium oxide, would the experimental % Mg be higher or lower than that expected for pure magnesium oxide? your answer with calculations. 4. Support

Answer 1

The balanced equation for the preparation of Magnesium oxide (M_g O) is 2 Mg (s) + O_2 (g) rightarrow 2 MgO (s) The balanced equation for the preparation of Magnesium nitride (Mg_3 N_2) is 3 Mg (s) + N_2 (g) rightarrow Mg_3 N_2 (s) Hydrolysis of Magnesium nitride will result in the formation of MgO The balanced equation is Mg_3 N_2 (s) + 3 H_2 O (l) rightarrow 3 MgO (s) + 2 NH_3 (g) To know whether % Mg is higher or lower by the contamination of Mg_3 N_2 in MgO, let us calculate the % of Mg in each substance. Molecular weight of MgO = 40 g/mol 1 mole of MgO contains 1 mole of Mg That is 40 g of MgO contains 24 g of Mg % Mg = 24/40 times 100 = 60% Molecular weight of Mg_3 N_2 = 3 times 24 + 2 times 14