300.0 g of ammonia react with 36.0 moles of sulfuric acid to produce ammonium sulfate. How many moles of excess sulfuric acid are left over after the reaction is complete?

Answer 1

sulfuric acid + ammonia -----> ammonium sulfate

Therefore,
H2SO4 + 2NH3 --> (NH4)2SO4

http://www.ausetute.com.au/sulfacid.html

This website will help you do the rest of the problem:
http://www.chem.tamu.edu/class/majors/tutorialnotefiles/limiting.htm