Practice Exam 3

Practice Exam 3 - General Chemistry I CHE 131 Summer 2009...

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General Chemistry I CHE 131 Summer 2009 Exam #3 Chapters 4, 5, 10 #1. Disulfur dichloride, S 2 Cl 2 , is used to vulcanize rubber. It can be made by treating molten sulfur with gaseous chlorine. S 8 (l) + 4 Cl 2 (g) 4 S 2 Cl 2 (g) How many moles of Cl 2 (g) are required to produce 103.5 g S 2 Cl 2 (g) ? a) 0.500 moles b) 0.766 moles c) 1.53 moles d) 3.07 moles e) 4.00 moles #2. Sucrose reacts with oxygen as follows: C 12 H 22 O 11 + 12 O 2 12 CO 2 + 11 H 2 O How many grams of O 2 are required to react with 1.00 g sucrose? a) 0.0350 g b) 0.0467 g c) 0.0935 g d) 1.12 g e) 2.24 g #3. Indicate which of the following is incorrect : (1) Mg (s) + FeCl 2 (aq) MgCl 2 (aq) + Fe (s) (2) ZnCO 3 (s) ZnO (s) + CO 2 (g) (3) 2 C (s) + O 2 (g) 2 CO (g) (4) CaCl 2 (aq) + Na 2 CO 3 (aq) CaCO 3 (s) + 2 NaCl (aq) a) Reaction (2) is a decomposition reaction. b) Reaction (1) and (4) are exchange reactions. c) Reaction (3) is a combination reaction. d) Reaction (4) is an exchange reaction. e) All of the above statements are correct. #4. Determine the correct stoichiometric coefficients for the following reaction:
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___B 2 O 3 (s) + ____HF (l) ____BF 3 (g) + ____H 2 O (l) a) 1, 3, 2, 3 b) 3, 6, 2, 3 c) 1, 6, 2, 3 d) 3, 6, 2, 6 e) 1, 1, 2, 3 #5. Aspirin is produced by the reaction of salicyclic acid and acetic anhydride. 2 C 7 H 6 O 3 (s) + C 4 H 6 O 3 (l) 2 C 9 H 8 O 4 (s) + H 2 O (l) salicyclic acid acetic anhydride aspirin If you mix 100. g of each of the reactants, what is the maximum mass of aspirin that can be obtained? a)
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Practice Exam 3 - General Chemistry I CHE 131 Summer 2009...

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