Announcements Bring handout from Tuesday to discussion tomorrow. Lab write-up and text HW due tomorrow. Electronic Homework due Monday, 10/14 (Type I) and Wednesday, 10/16 (Type II) by 7:00pm

Clicker #1 How many cars can we make? A) 3 B) 4 C) 6 D) 12 E) 16

Stoichiometry Calculate amounts of reactants or products given an amount of reactant or product. We need to compare what we are given to the mole ratio that reacts (have vs. need) We need a balanced equation (gives us the ratios). Coefficients give us the amount we need (# moles or # particles).

Clicker #2 If you have 8 moles of hydrogen and all the oxygen you need, how many moles of water can you make? 2H2 + O2 → 2H2O A) 1 mol B) 2 mol C) 4 mol D) 8 mol E) 16 mol

Clicker #3 If you have 6 moles of oxygen and all the hydrogen you need, how many moles of water can you make? 2H2 + O2 → 2H2O A) 1 mol B) 2 mol C) 3 mol D) 6 mol E) 12 mol

Clicker #4 If you have 8 moles of hydrogen and 6 moles of oxygen, how many moles of water can you make? 2H2 + O2 → 2H2O A) 6 mol B) 8 mol C) 12 mol D) 14 mol E) 16 mol

Starting with Mass… If you have 48.0 g of oxygen and all the hydrogen you need, what mass of water is produced? 2H2 + O2 → 2H2O

Example #1 N2 + 3 H2  2 NH3 168.12 g N2 reacts with 12.096 g H2 What mass of NH3 is produced?

Example #2 N2 + 3 H2  2 NH3 10.0 g N2 reacts with 10.0 g H2 What mass of NH3 is produced? How much (in grams) of which reactant is leftover?