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Unformatted text preview: . ... CHEMISTRY121-- FALL 2001-- COMMONEXAM #3 Page-1- PART A (16 multiple choice questions worth 4 point each: 20 minutes) 1. A sample of gas occupies a volume of 430.0 mL at 28.2C and 754.2 mmHg. If the sample 'is cooled to 20.0oC, what is the pressure of the gas in millimeters of mercury? a. ~ c. 534.9 733.7 760.0 842.3 d. 2 . The number of collisions of Ar atoms with the walls of their containerper unit time when the temperature decreases. when the average kinetic energy per molecule increases. when CO2 is added to the container at constant tempera a. Increases b. Decreases V Increases ture. d. Remains the same temperature. when CO2 is added to the container at constant 3. A real gas most closely approaches the behavior of an ideal gas at a. @ 0.50 atm and 500 K 1 atm and 273 K 15 atm and 200 K 15 atm and 500 K S+-p-=-IA7V'< lr ~7!>,t. c. d. 4. Calculate the average speed of a neon atom at 30.DoC and 1.23 atm. (R = 8.314 kg.m2/(s2.mol.K) a. 19.4 mls b. 60.7 ml s c. 160 m/s @ 612 m/s 5. The pressure of a gas mixture iS~.50 atmosphe~ If the mole fraction of the nitrogen component of this gas is 0.420, then what is the partial pressure of nitrogen? (R = 0.0821 L.atm/mol.K) 1'e (' it\ e, t 'Pr '),5 Ur-( a. 0.485 atm @ 0.630 atm c. 1.41 atm d. 6.30 atm ~I-=ry:.,-Y, .:: (.4~o)(1.5")( 7~(:>..~t4f1) p":; 478". r """~!$f ~<r,'"(~~tf:....
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This note was uploaded on 11/19/2010 for the course R 102 taught by Professor Morrison during the Spring '10 term at Rutgers.
- Spring '10