Question

NH4NO3(s) H2O(g) + N2(g) + O2(g)

Consider the unbalanced equation above.

What will be the total volume of gas produced at 720. mm Hg and 570.0°C when 2.50 g of NH4NO3 completely decomposes? Use molar masses with at least as many significant figures as the data given.

Answer 1

You don't have an equation because you don't have an arrow. And I can't figure out where the arrow goes. When you do, here is a link that will get you through the remainder of the problem. This link is an example of a stoichiometry problem. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html