Date

- Monday, February 12th

Class Business

- Questions?
- Collect LNB

Recap Last Class – Percent Composition

- given formulas
- asked for a mass breakdown
- assume 1 mole of the substance
- process
- new example: propane (C3H8)

New Idea – Empirical Formulas

- given mass percent
- determine formula
- empirical vs. true formula
- examples

Empirical Formulas – Process

- assume 100-gram sample
- percent to grams
- gram to moles
- divide by smoles
- multiply ’til whole

Practice

- practicing

Next Class Meeting = Test

- Objectives: Unit 7 & Unit 8 (let’s look now)
- Practice Problems in textbook
- I will post last year’s test as well

Homework

- Study for the test

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