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chapter3_key - Chem127 DrAbel 1 Chapter 3 Worksheet...

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Chem 127 Dr Abel 1 Chapter 3 Worksheet Suggested Chapter 3 book problems: 2, 8, 10, 14, 18, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 44, 46, 50, 51, 53, and 55, 61, 63, 67, 71, 73, 75, 77, 81, 83, 89, 92, 94, 96, 98, 100, 102, and 120 1. The controversial artificial sweetener saccharin has the molecular formula C 3 H 5 O 3 NS. What is the mass in grams of one molecule? 135.1 gC 2 H 5 O 3 NS mole " 1 mole 6.022 x 10 23 molecules = 2.243 x 10 # 22 g / molecule 2. An Alka Seltzer tablet contains 324 mg of aspirin (C 9 H 8 O 4 ), 1.9 g of NaHCO 3 and 1.0 g of citric acid (C 6 H 8 O 7 ). Calculate the number of molecules of aspirin in the tablet. 0.324 gC 9 H 8 O 4 1 mole 180.09 gC 9 H 8 O 4 " 6.022 x 10 23 molecules mole = 1.08 x 10 21 molecules 3. How many moles of nitrogen atoms are in 51.7 g of ammonium nitrate? 51.7 gNH 4 NO 3 mole " 1 moleNH 4 NO 3 80.02 g " 2 molesN 1 moleNH 4 NO 3 = 1.29moles of N atoms 4. What are the total number of moles of atoms in 62.4 g of silver (I) sulfate? 62.4 gAg 2 SO 4 moleAg 2 SO 4 311.8 gAg 2 SO 4 " " 7 moles of atoms 1 mole Ag 2 SO 4 " = 1.40 moles 5. Sodium perborate, NaBO 3 , is an "oxygen bleach" that releases oxygen, which has the bleaching action. How many grams of NaBO 3 are in 4.65 moles? 4.65 molesNaBO 3 " 81.8 gNaBO 3 1 moleNaBO 3 = 3.80 x 10 2 gNaBO 3 6. The Statue of Liberty is made of 2.0 x 10 5 lbs of copper sheets bolted to a framework.
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