CEM383Practice Exam1

CEM383Practice Exam1 - CEM 383 Practice Exam 1 Fall 2007 1....

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1 CEM 383 Practice Exam 1 Fall 2007 1. The atmospheric pressure on the surface of Venus is 90 bar and it is composed of 96% CO 2 and 4% of various other gases. The surface temperature of the planet is 730K. (R=0.083 L•bar/mol•K = 8.31 J/K•mol) a) What is the partial pressure of CO 2 on the surface? b) What mass of CO 2 is present per liter? 2. A mixture of CH 4 (g) and C 2 H 6 (g) is contained in a glass bulb of 0.5 L volume at 25 ºC. The total pressure is 1.25 bar and the mass of the gas in the bulb is 0.530 g. a) What is the average molar mass of the gas mixture?
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2 b) What is the mole fraction of CH 4 (g) in the bulb? 3. Use the Van der Waals coefficients given in the table below to label the compressibility data with the appropriate gas identity, A, B or C. Gas a(bar•L 2 /mol 2 ) b (L/mol) A 0.21 0.0174 B 1.35 0.0386 C 4.25 0.0380
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3 4. The pressure of steam in a 20.0L tank at 400K is 14.0 bar. How long is the time interval between collisions for a H 2 O molecule moving about in
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CEM383Practice Exam1 - CEM 383 Practice Exam 1 Fall 2007 1....

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