To Do… Electronic homework Exam 2: Thursday, March 15 OWL: Chapter 9 (Part 1): Friday, March 2 Chapter 9 (Part 2): Wednesday, March 7 Chapter 13 (Gas Stoichiometry): Friday, March 9 Chapter 15 (Solution Stoichiometry): Tuesday, March 13 Lon-Capa: Exam 2 review: due Wednesday, March 14 by 10 pm Exam 2: Thursday, March 15

To Do… Lab Section tomorrow Lectures Discussion Section Pre-lab assignment due before lab (page 42) Lectures Continue reading Chapter 9 and doing the text homework. Also, Sections 13.10 and 15.6 & 15.7 Discussion Section Turn in Chapter 9 homework. Turn in lab write-up.

Stoichiometry Determine the amount(s) of reactant(s) or product(s) given amount(s) of reactant(s) or product(s). We must have a balanced chemical equation. Reactions occur by numbers of atoms/molecules.

Determine Number of Moles Use mass and molar masses. Use volume and concentration for solutions. Use pressure, volume, and temperature for gases.

Previous Lecture Questions 1. If you have 8 moles of hydrogen and all the oxygen you need, how many moles of water can you make? 2. If you have 6 moles of oxygen and all the hydrogen you need, how many moles of water can you make? 3. If you have 8 moles of hydrogen and 6 moles of oxygen, how many moles of water can you make?

Clicker Question 12 mol H2 reacts with 5 mol O2 Limiting Mol Product Leftover Reactant A) H2 6 mol 1 mol O2 B) H2 12 mol 7 mol O2 C) O2 5 mol 7 mol H2 D) O2 10 mol 2 mol H2 E) Neither 12 mol None

Clicker Question 16.128 g H2 reacts with 96.00 g O2 Limiting Mol Product Leftover Reactant A) H2 4 mol 1 mol O2 B) H2 8 mol 1 mol O2 C) O2 1.5 mol 2 mol H2 D) O2 6 mol 2 mol H2 E) Neither 6 mol None

Solids, Solutions, and Gases NaHCO3(s) + HC2H3O2(aq) → NaC2H3O2 (aq) + H2O(l) + CO2(g) Which balloon will be the biggest? Trial # Mass of NaHCO3 Volume of 0.833 M HC2H3O2 1 3.30 g 150.0 mL 2 5.70 g 3 10.5 g 4 21.0 g 5 31.8 g