If water I'd added to magnesium nitride, ammonia gas is produced when the mixture is heated

Question

Mg3N2 (s) + 3H2O (l) ----> 3MgO) (s) + 2NH) (g)
*Only the numbers at the beginning aren't subscripts*

If 10.3 g of magnesium nitride is treated with water, what volume of ammonia gas would be collected at 24 degrees C and 752 mm Hg?

I don't know how to set this up D:

Answer 1

Here is a solved example stoichiometry problem. Just follow the steps. For the volume, use PV = nRT.
http://www.jiskha.com/science/chemistry/stoichiometry.html