Stoichiometry

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.

To make a bike?

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

+  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 = 223.40 g/mol 32.00g/mol × 3 = 96.00g/mol 159.70g/mol × 2 = 319.40g/mol 223.40g/mol + 96.00g/mol = 319.40g/mol 319.40g/mol

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

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

Mass O2 Mass Fe2O3 Mole O2 Mole Fe2O3 Particles O2 Particle Fe2O3

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