1. Stoichiometry

2. What is Stoichiometry? “To measure elements”
The study of the quantitative relationship between reactants and products in a chemical reaction.
A balanced chemical equation can be interpreted in terms of particles, mass, and moles.

3. To make a bike?

4. iron + oxygen  iron (III) oxide
What is the balanced chemical equation?
What does this tell us?

5. +  Iron Oxygen Iron (III) Oxide 4 Fe 3 O2 2Fe2O3 4 moles Fe
4 atoms Fe
3 molecules O2
2 formula units Fe2O3
4 moles Fe
3 moles O2
2 moles Fe2O3
55.85g/mol × 4 = g/mol
32.00g/mol × 3 = 96.00g/mol
159.70g/mol × 2 = g/mol
223.40g/mol g/mol = g/mol
319.40g/mol

6. Mole Ratio
Stoichiometry requires a mole ratio, which is the ration between moles of one substance to moles of another.

7. Mole Ratios are used to relate the amount of moles of the different parts of a reaction
Mole Fe
Mole O2
Mole Fe2O3

8. Mass O2
Mass Fe2O3
Mole O2
Mole Fe2O3
Particles O2
Particle Fe2O3

9. Read and look at sample problems on pgs. 304 – 311 in your textbook!