FinalCSum10Sol

FinalCSum10Sol - Useful constant The gas constant R = 8.314...

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Useful constant: The gas constant: R = 8.314 J K 1 mol 1 R = 0.08206 L atm K 1 mol 1 Faraday constant: F = 96485 Coul mol 1 Avogadro’s number: N A = 6.02214 x 10 23 mol 1 1atm = 760 torr Problem 1 (20 points) i . An ideal gas undergoes an adiabatic process during which 500J of work are done by the system. The temperature change is (a) zero (b) negative (c) positive ii . For the reaction CH 4 (g)+2O 2 CO 2 + 2H 2 O at 298K Δ S 0 is (a) negative (b) zero (c) positive iii . The formation of an ideal solution has a positive Δ S. Δ G for this process is (a) negative at high temperatures (b) negative at low temperatures (c) negative at all temperatures iv . Which of the following aqueous solutions has the highest boiling point? ( a) 0.2M Cu(NO 3 ) 2 ( b) 0.2M NaCl (c) 0.1M (NH 4 ) 3 PO 4 v . Which of the following compounds has the lowest boiling point (a) C 2 H 6 (b) CH 4 (c) C 2 H 5 OH vi . The cell potential of some electrochemical cell is 0.72V. As one draws current from this cell, the measured cell potential is going to (a) increase with time (b) decrease with time (c) not change vii. The triple point of a substance is at 5 atm. The phase expected when the solid phase of this substance is heated under standard pressure is a (a) liquid (b) vapor (c) supercritical fluid viii . For some redox reaction: Δ H 0 = 100kJ, Δ G 0 = 120kJ. The maximum amount of useful work one can get from an electrochemical cell in which this reaction takes place is: (a) 100 kJ (b) 120 kJ (c) 20 kJ ix . Silicon (Si) doped with Boron (B) is an example of a
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FinalCSum10Sol - Useful constant The gas constant R = 8.314...

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