1. Stoichiometry The calculation of quantities using chemical reactions
Example: If we want to make 1.5 moles of Fe2O3 using Fe + O2, how much do we need of the reactants to start?

2. Mole Ratio
Conversion factor derived from the coefficients of a balanced equation.
It’s the BRIDGE to get across to other elements/compounds

3. N2 + 3H2  2 NH3 1 mole N2 / 3 mole H2 2 mole NH3 / 1 mole N2

4. Mole-Mole Calculations
Predict products (possible)
Balance equation
Determine mole ratios
Start with what the problem gives you - ALWAYS!
Use the correct mole ratio

5. Magnesium and oxygen react to form ____________.
How many moles of the product are produced when 1.2 moles of oxygen react with excess magnesium?
How many moles of magnesium reacted in the problem above?