#3 - Spring 07

#3 - Spring 07 - CHE 131 Exam 3, Spring 2007 Multiple...

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CHE 131 Exam 3, Spring 2007 Multiple Choice 1. If 365 g of magnesium reacts with excess oxygen to produce 326 g of magnesium oxide, what is the percent yield for the reaction? 2 Mg + O 2 2 MgO a. 53.9% b. 32.6% c. 89.3% d. 12.4% e. 92.6% 2. What is the oxidation number of P in PO 4 3- ? a. +3 b. -3 c. +5 d. -5 e. -2 3. Which of the following has dipole-dipole interactions between its molecules? a. CBr 4 b. CO c. F 2 d. BH 3 e. CO 2 4. If 7.63 g of an unknown gas occupies 79.1 mL at 25.02 ° C and 7.55 atm of pressure, what is the molecular weight of that gas? a. 312 b. 0.312 c. 26.2 d. 3.21 × 10 -3 e. 31.2 5. What conditions are referred to as standard temperature and pressure (STP) for gas behavior? a. 0 ° C and 1 mm Hg b. 298 K and 760 torr c. 25 ° C and 1 atm d. 273 ° C and 1 atm e. 0 ° C and 1 atm
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6. What species is the reducing agent in the reaction below? Zn(s) + CuSO 4 (aq) ZnSO 4 (aq) + Cu(s) a. Zn 2+ b. SO 4 2- c. Zn d. Cu 2+ e. CuSO 4 7. How many grams of HCl are required to completely react with 25.0 g of aluminum? 2 Al + 6 HCl 2 AlCl 3 + 3 H 2 a. 22.6 g b. 136 g c. 102 g d. 67.5 g e. 248 g 8. A mixture of He, Ne and Ar has a total pressure of 0.80 atm and is found to contain 0.55 mol He, 0.94 mol Ne and 0.35 mol Ar. What is the partial pressure (in atm) of each gas? He Ne Ar a. 0.44 0.75 0.28 b. 1.5 .85 1.5 c. 0.095 0.16 0.060 d. 2.7 1.6 4.2 e. 0.24 0.41 0.15 9. Which statement about the reaction below is true, given large amounts of reactants? NaCl + AgNO
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This test prep was uploaded on 04/17/2008 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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#3 - Spring 07 - CHE 131 Exam 3, Spring 2007 Multiple...

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