Unit 3 Review Sheet

Unit 3 Review Sheet - 10. You are required to run the...

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Name: ________________________________________ Date: ____________ WKST #10: Unit 3 Review Sheet (20 points) Period: ___________ 1. A sample of ZnCl 2 weighs 14.6 g. How many molecules of ZnCl 2 are there? 2. If you have 18.5 L of F 2 gas at STP, how much will that sample weigh? 3. A sample contains 4.75x10 23 atoms of tin. How much does this sample weigh in grams? 4. How many water molecules are in a sample that weighs 25.3 g? 5. What is the percent composition by mass of each element in H 3 PO 4 ? 6. What is the difference between an empirical and a molecular formula? 7. A compound is 37% nitrogen and 63% oxygen. What is the empirical formula for this compound? 8. A compound is 7% hydrogen, 40% carbon, and 53% oxygen. Determine its empirical formula. 9. The empirical formula of a compound is COH 3 . The molar mass of its molecular formula is 62 g/mol. What is the molecular formula of this compound?
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Unformatted text preview: 10. You are required to run the following reaction in the laboratory: ____ H 2 SO 4 + ____ NaOH ____ Na 2 SO 4 + _____ H 2 O a. If you want to produce 3 moles of Na 2 SO 4 how many moles of reactants would you need? b. If you want to produce 0.5 mole of Na 2 SO 4 how many moles of reactants would you need? c. Using the balanced equation, if you start with 15g of H 2 SO 4 and 28g of NaOH, how much Na 2 SO 4 will be produced? Which is the limiting reactant? d. At the end of the reaction, you collect 16.2g of Na 2 SO 4 . What was your % yield? 11. The reaction below is used to synthesize aspirin. (Equation is already balanced). a. If you use 90.0 g of salicylic acid and 80.0 g of acetic anhydride, how many grams of aspirin will be produced? Which reactant is limiting? b. The reaction produces 112 g of aspirin. What is the percent yield of the reaction?...
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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Unit 3 Review Sheet - 10. You are required to run the...

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