090501_Quiz4_rev2 - 1 Your&ame/8 Chem340 Physical...

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Unformatted text preview: 1 Your &ame . [ /8] Chem340 Physical Chemistry for Biochemists Quiz 4 May 1, 2009 Q1. (Calculation) Consider a 20.0-L sample of moist air at 60 °C and 1.00 atm in which the partial pressure of water vapor is 0.190 atm . Assume that dry air has the composition 78.0 mol % N 2 , 21.0 mol % O 2 , and 1.00 mol % Ar. What is the mole percentage of N 2 ? (a) 87% (b) 78% (c) 70 % (d) 64% (e) 58% (f) 15 % (g) 8% Q2 . The figure right shows the molar volume dependence of the pressure for CO 2 . Considerable deviation of the behavior from the ideal gas (pressure drop) is observed at 40 ° C or lower. Select two correct statements on the diagram and the phases of CO 2 . (a) At 40 ° C and V m ~ 0.1 Lmol-1 , the phase of CO 2 is a mixture of gas and liquid. (b) At 31.4 ° C (critical temperature), the phase of CO 2 is a mixture of gas and liquid at only one value of V m (critical volume) (c) At 20 ° C at the point D, the phase of CO 2 is purely liquid. (d) At 20 ° C at the point B, the phase of CO 2 is purely gas. (e) At 0 ° C at Vm = 0.6 m , the CO 2 system is solidified as dry ice. Q3. The graph right shows a Scatchard plot that correlates the ligand concentration C L with average number of ligands (v) on a protein having N binding sites. Assume that all the sites have a common...
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This note was uploaded on 04/14/2010 for the course CHEM 340 taught by Professor Yoshitakaishii during the Spring '07 term at University of Illinois, Urbana Champaign.

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090501_Quiz4_rev2 - 1 Your&ame/8 Chem340 Physical...

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