CP13 – Empirical Formulas

Date

• Thursday, February 9th

Recap – Percent Composition

• homework questions?
• how do we show work?

New Idea – Empirical Formulas

• how do we go from mass percent to formulas?
• what is the poem that describes this?
• examples

Poem

• percent to grams
• grams to moles
• divide by smoles
• multiply ’til whole

Homework

• Ch. 7 (30-ace)