Enthalpy of formation is the formation of 1 mole of a substance from its elements in their standard states. eg for copper(II) sulphate, CuSO4(s) the equation would be

2 C3H6 (g) + 2 NH3 (g) + 3 O2 (g) ---> 2 C3H3N (g) + 6 H20 (g) If 15.0 g of C3H6, 10.0 g 02, and 5.00 g NH3 are reacted, what mass of acrylonitrile can be produced, assuming 100% yield. I pretty much understand how to do the question but I dont understand how to find how much is produced because theres three reactants and how do use molar ratio ...

1) Determine the resulting nitrate ion concentration when 95.0 mL of .992 M potassium nitrate and 155.5 mL of 1.570 M calcium nitrate ion are combined.2) Nitroglycerin decomposition is 4 C3 H5 N3 O9---> 6 N2 + 12 CO2 + 10 H20 + O2