Exam 2 Fall 2010

If an error has been made in scoring your answers

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Unformatted text preview: possible after the examination. If an error has been made in scoring your answers, tell your instructor within 48 hours of the posting of your score. BE SURE THAT YOUR TEST HAS 28 QUESTIONS, A PERIODIC TABLE, AND ONE SHEET OF SCRATCH PAPER. You may NOT use your own scratch paper during this examination. Cell phones and pagers are to be turned off and out of sight during the exams. 1. Determine the mass percent of lithium in Li2CO3. A. B. 2. 21.3% 5.9% C. D. 9.7% 18.8% How many sodium atoms are contained in 99.6 mg of Na2SO3? A. B. 3. 1.52 10 sodium atoms 2.10 10 sodium atoms 21 27 C. D. 4.76 10 sodium atoms 9.52 10 sodium atoms 20 20 A 3.48 g sample of rhenium reacts with sulfur to form 5.58 g of the rhenium sulfide. What is the empirical formula of the sulfide? A. B. 4. ReS3 Re2S7 C. D. Re3S2 Re2S3 Choose the correct balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate. A. B. C. D. Al(C2H3O2)2 (aq) + (NH4)2PO4 (aq) Al(C2H3O2)2 (aq) + (NH3)2PO4 (aq) Al(C2H3O2)3 (aq) + (NH3)2PO4 (aq) Al(C2H3O2)3 (aq) + (NH4)3PO4 (aq) AlPO4 (s) + 2 NH4C2H3O2 (aq) AlPO4 (s) + 2 NH3C2H3O2 (aq) AlPO4 (s) + 2 NH3C2H3O2 (aq) AlPO4 (s) + 3 NH4C2H3O2 (aq) 5. How many moles of molecular oxygen are required to produce 2.33 moles of water in the reaction below? Assume that there is excess C3H7SH present. C3H7SH(l) + 6 O2(g) A. B. 1.55 moles O2 3.50 moles O2 C. D. 3 CO2(g) + SO2(g) + 4 H2O(g) 2.33 moles O2 6.21 moles O2 6. Consider the following balanced reaction. How many grams of water are required to form 75.9 g of HNO3? Assume that there is excess NO2 present. 3 NO2(g) + H2O(l) 2 HNO3(aq) + NO(g) A. B. 7. 38.0 g H2O 10.9 g H2O C. D. 21.7 g H2O 43.4 g H2O Consider the balanced equation: 2 N2H4(g) + N2O4(g) 3 N2(g) + 4 H2O(g) How many moles of the excess reactant remain if 15.0 g of N2H4 reacts with 20.0 g of N2O4? A. B. 8. 0.033 mol 0.435 mol C. D. 0.086 mol 0.219 mol What volume of a 0.184 M NaNO3...
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This document was uploaded on 03/13/2014 for the course CHE 105 at Kentucky.

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