Magnesium burns in air to produce magnesium oxide, MgO, and magnesium nitride, Mg3N2. Magnesium nitride reacts with water to give ammonia.

Question

Mg3N2(s) + 6 H2O(l) → 3 Mg(OH)2(s) + 2 NH3(g)

What volume of ammonia gas at 24°C and 753 mmHg will be produced from 4.46 g of magnesium nitride?

Answer 1

A stoichiometry problem. Just follow the steps in this example.
http://www.jiskha.com/science/chemistry/stoichiometry.html

Answer 2

explain how the mass of magnesium changes using a particle modle

Answer 3

This is a question; laughing gas is prepared by heating a mixture if sodium trioxonitrate v and ammonium tetraoxosulphate vi what happens when a candle is placed in a gas jar of this gas