Question

How many grams of Nitric oxide are required to produce 145g of nitrogen in this reaction:
Al2O3(s)+6NO(g)---->5N2(g)+6H2o(l)

Answer 1

You have a stoichiometry problem. Here is a worked example that will work all of your stoichiometry problems. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html