Chemistry Ch 12 Stoichiometry Notes #1

What is stoichiometry? Study of quantitative relationships btwn amounts of reactants used and products formed by a chemical reaction Based on the law of conservation of mass Chapter 11 math is the basis of the chapter 12 math – if you don’t get it – ask!

Interpreting equations 4Fe (s) + 3O 2 (g) -> 2Fe 2 O 3 (s) –Particles –Moles –Mass

Example - interpreting N 2 (g) + 3H 2 (g) -> 2NH 3 (g) –Particles –Moles –Mass

Homework Interpreting 6-14 on side 1 of sg Number 1 on the supplemental That much should be DONE for tomorrow!

Mole Ratios Ratio between the numbers of moles of any 2 substances in a balanced chemical equation We will be using mole ratios as conversions factors in future math problems Mole ratios show relationships between reactants and products in equations

Example – Mole Ratio 2Al (s) + 3Br 2 (l) -> 2AlBr 3 (s) How many will there be? Number of species x 1 less Species = reactants and products

Example – Mole Ratio What is the mole ratio with the biggest value? What is the mole ratio relating Al to Br? What is the mole ratio relating the product to Al? HW – back of SG and #2 on supp