Chemistry – Apr 5, 2018 P3 Challenge –

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Presentation transcript:

Chemistry – Apr 5, 2018 P3 Challenge – Determine the molar mass of Fe(NO3)3 Today’s Objective – Mass Percent Get out Mole Worksheet for HMK check Agenda Hmk Review Mass percent (review) Mass percent from formulas Assignment: Empirical Formula Worksheet, p1-2

Mass Percent Composition (Review) Given the number of grams of each element in a sample of a compound, you can calculate the mass percent composition. Ex: Experiment shows a 43.8 g sample of sodium chloride contains 17.2 g of sodium. What is the mass percentage of each element in sodium chloride? (part divided by whole times 100)

Determine mass percentage from formula Because a chemical formula represent relationships of moles of elements, you can determine the mass percent of any substance using molar masses. No experiment is needed! Ex: Find the mass percentage of each element in NaCl.

Exit Slip - Homework Exit Slip: Determine the mass percent composition for NH3. What’s Due? (Pending assignments to complete.) Empirical Formula worksheet, p1-2 What’s Next? (How to prepare for the next day) Read p100-102, p224-232, 241 p246-247