1. Moles to Moles Stoichiometry Calculation Notes
CP Chemistry

2. Stoichiometry
the study of quantitative relationships between amounts of reactants used and the products formed in a chemical reaction
shows the conservation of matter
mass of products = mass of reactants
requires balanced equations!!!

3. Mole Ratios
ratio of numbers between the numbers of moles of any two substances in a balanced chemical equation
used in stoichiometric calculations
example: 2 Al + 3 Br2  2 AlBr3
ratio of Al:Br2 is 2:3
ratio of Al:AlBr3 is 2:2 (or 1:1)
ratio of Br2:AlBr3 is 3:2

4. Mole to Mole Calculations
problem gives you moles of reactant or product and asks for moles of another reactant or product in the chemical equation

5. Steps to Solving Mole to Mole Problems
Balance chemical equation
Place number of moles given above compound in equation
Place an x above the compound for which you are calculating the number of moles
Pull down the ratios from the equation
Cross multiply to solve for x

6. Example 1
How many moles of potassium needs to react with water to produce 3 moles of H2 gas?
K + H20  KOH H2

7. Example 2
How many moles of water can be produced with 6 moles of hydrogen? H2 + O2  H2O

8. Example 3
How many moles of oxygen would be required to fully react with 8 moles of hydrogen? H2 + O2  H2O

9. Example 4
How many moles of water can be produced with 4 moles of oxygen? H2 + O2  H2O

10. Example 5
How many moles of hydrogen would be required to produce 10 moles of water? H2 + O2  H2O

11. Example 6
How many moles of oxygen would be needed to produce 20 moles of water? H2 + O2  H2O