1. MOLE TO MOLE RATIO
Chapter 9 section 2

2. Mole to Mole Ratio
The coefficient in a balanced chemical equation can be used to determine the relative number of molecules, formula units, or moles of a compound involved in a chemical reaction.
The coefficients can also be used to write a Molar Ratio. Molar ratios are conversion factors that can be used to relate:
Moles of product formed from a certain number of moles of a reactant.
Moles of reactant needed to form a certain number of moles of a product.
The number of moles of a particular reactant needed to completely react with a certain number of moles of a second reactant.

3. For the following reaction
4 NH O2  NO H2O
the following molar ratios can be written:
4 mol NH3 4 mol NH3 4 mol NH3
5 mol O2 4 mol NO 6 mol H2O
5 mol O2 5 mol O2 4 mol NO
4 mol NO 6 mol H2O 6 mol H2O

4. Sample Question
What is the molar ratio between Li and N2 (both reactants) in a combination reaction?
6Li N  Li3N
6 mol Li 1 mol N2
1 mol N2 6 mol Li