- Returned Quizzes - Moles & Mass
- Reviewed Empirical & Molecular Formula Problems
- Discussed Chromatography separation techniques w/ paper chromatography mini-lab activity
Homework:
- Percent Composition & Molecular Formula WS (below)
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| Please note that questions 1 & 2 are incorrect. Both problems were percent composition problems, but I treated them like empirical formula problems. You should have gotten the correct answer by multiplying the % composition of each element by the total mass of the sample. For example, A 2.786 gram sample of a substance containing 66.5% C would be: (0.665) x (2.786 g) = 1.85 grams of Carbon. |
NOTE:
- Percent Composition Labs are due Friday 2/4
- Quiz covering percent composition problems, empirical & molecular formula problems
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