110128_Quiz1_answer

110128_Quiz1_answer - Your Name . Quiz 1 Jan 28, 2011 [...

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Your Name . [ / 1 0 ] Chem340 Physical Chemistry for Biochemists Quiz 1 Jan 28, 2011 Q1 . The right graph compares P-V graphs for an ideal gas (solid line) and van der Walls (vdW) gas (dotted line). Select ALL the correct statements. (a) At V = 0.05 L, an attractive force is dominant in the vdW gas. (b) At V = 0.05 L, a repulsive force is dominant in the vdW gas. (c) At V = 0.15 L, an attractive force is dominant in the vdW gas. (d) At V = 0.15 L, a repulsive force is dominant in the vdW gas. (e) At V = 0.15 L, an attractive force is dominant in the ideal gas. (f) At V = 0.15 L, a repulsive force is dominant in the ideal gas. Q2. Calculate the sum of the average translational energy and rotation energy of one molecule of C 6 H 6 assuming that it is an ideal gas. Choose the closet from the choices below. (a) 0, (b) RT/2 (b) k B T/2 (c) RT (d) k B T (e) 3RT/2 (f) 3k B T/2 (g) 5RT/2 (h) 5k B T/2 (i) 3RT (j) 3k B T Q3 . Consider a 4.0-L sample of moist air at 60.°C and 1 atm in which the partial pressure of water vapor is 0.120 atm. Assume that dry air has the composition 78.0 mol % N 2 , 21.0 mol % O 2 , and 1.00 mol % Ar. The percent relative humidity is defined as %RH =P H2O /P H2O *, where P H2O is the partial pressure of water in the sample and P
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This note was uploaded on 03/06/2011 for the course CHEM 340 taught by Professor Staff during the Spring '08 term at Ill. Chicago.

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