e2_131_f10 - Exam 2, CHE 131 Fall 2010 Multiple Choice, 4...

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Exam 2, CHE 131 Fall 2010, Page 1 of 6 Exam 2, CHE 131 Fall 2010 Multiple Choice, 4 points each On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. A copper ore consisting of 12.5% copper(II) sulfide, when heated and reacted with oxygen gas, produces copper(II) oxide and sulfur dioxide. If the reaction has a 90.0% yield, how many grams of copper(II) oxide are produced when 1.00 kg of the copper ore is processed? A. 93.6 g B. 104 g C. 116 g D. 150 g E. 749 g ____ 2. Molarity, M , is defined as __________ A. moles of solute dissolved in 1 kg of solvent. B. moles of solute dissolved in the solution. C. moles of solute dissolved in 1 L of solvent. D. moles of solute dissolved in 1 L of solution. E. moles of solute dissolved in 1 mol of solvent. ____ 3. What volume of 12 M HCl solution needs to be diluted to produce 500 mL of 3.0 M HCl solution? A. 500 mL B. 2000 mL C. 250 mL D. 1000 mL E. 125 mL ____ 4. In an experiment, 25.0 mL of a gas with a pressure of 1.00 atm is contained in a balloon at 25.0°C. The balloon is then cooled to 5.0°C, and the pressure is found to be 0.750 atm. What is the volume of the gas under the new conditions? A. 25.0 mL B. 17.5 mL C. 20.1 mL D. 35.7 mL E. 31.1 mL
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Exam 2, CHE 131 Fall 2010, Page 2 of 6 ____ 5. Given the standard enthalpies of formation for the following substances, determine the change in enthalpy for the combustion of 1.0 mol of butane. Substance H (kJ/mol) C 4 H 10 ( g ) –124.7 CO 2 ( g ) –393.5 H 2 O( g ) –241.8 A. –5317 kJ/mol B. –3647 kJ/mol C. +5317 kJ/mol D. –2658 kJ/mol E. +2658 kJ/mol ____ 6. What is the oxidation number of P in H 2 PO 4 ? A. 6
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e2_131_f10 - Exam 2, CHE 131 Fall 2010 Multiple Choice, 4...

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