Exam 3 (Red) - 2010

Exam 3 (Red) - 2010 - CHEM 188 Spring 2010 Hour Exam 3(Red...

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CHEM 188 – Spring, 2010 Hour Exam 3 (Red) April 8, 2010 Instructions: Your scantron answer sheet must show your NAME , 7-DIGIT KU ID NUMBER , and LAB SECTION . (Begin these entries at the LEFT end of the space provided.) In answering the questions, be careful to fill in the corresponding circles on the answer sheet according to the number of the question on the exam. USE A SOFT (No. 2) PENCIL . Note that a periodic table of the elements is attached at the end of the exam. Useful information: Gas constant R = 8.314 J K - 1 mol - 1 = 0.0821 L atm K - 1 mol - 1 Boltzmann constant k = 1.38 × 10 - 23 J K - 1 Conversion factor: 1 L atm = 101.3 J 1. A 75 kg person drinks 650 g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 21% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? [Hint: The work done in ascending is given by mgh , where m is the mass (in kilograms), g the gravitational acceleration (9.8 m/s 2 ), and h the height (in meters.)] A. 173 B. 257 C. 349 D. 449 E. 557 2. The sign of H for the process H 2 O( g ) H 2 O( l ) is A. positive, and the process is endothermic B. negative, and the process is endothermic C. positive, and the process is exothermic D. negative, and the process is exothermic E. none of the above 3. An ideal gas is allowed to expand at constant temperature from a volume of 1.00 L to 5.00 L against a constant external pressure of 0.500 atm. What is the value of w , the work done on the gas? A. -203 J B. – 2.00 J C. 0 J D. +2.00 J E. +203 J 4. Calculate w , the work done on the system, when 20.0 g of potassium reacts with water to form hydrogen gas at 2.00 atm and 40 o C. (Assume ideal gas behavior.) 2K( s ) + H 2 O( l ) 2KOH( aq ) + H 2 ( g ) 1
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A. –0.333 kJ B. –0.666 kJ C. –1.33 kJ D. –2.66 kJ E. none of these 5. A gas is compressed, during which 150 J of
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This note was uploaded on 04/14/2010 for the course CHEM 13891 taught by Professor Hierl during the Spring '10 term at Kansas.

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Exam 3 (Red) - 2010 - CHEM 188 Spring 2010 Hour Exam 3(Red...

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