WA06_CHE-121-mar14

# WA06_CHE-121-mar14 - Thomas Edison State College General...

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Thomas Edison State College General Chemistry I with Labs (CHE-121) Section no.: OL009 Semester and year: May 2015 Written Assignment 6: Gases Answer all assigned questions and problems, and show all work. 1. A gas occupying a volume of 725 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume? (5 points) P1=0.970 P2=0.541 V1=725ml V2=1300ml (P1)(V1) = (P2)(V2) (0.970atm)(725ml) = (0.541atm)(V2) (0.970atm)(725ml)/(0.541atm) = 1299.907ml = 1300ml (Reference: Chang 5.19) 2. The volume of a gas is 5.80 L, measured at 1.00 atm. What is the pressure of the gas in mmHg if the volume is changed to 9.65 L? (The temperature remains constant.) (5 points) (1.00atm)(5.80L) = (P2)(9.65L) 5.80L/9.65L = 0.601atm = (0.601)(760) = 456.788mmHg (Reference: Chang 5.21) 3. Why is the density of a gas much lower than that of a liquid or solid under atmospheric conditions? What units are normally used to express the density of gases? (5 points) There are much weaker intermolecular forces between gas molecules. Gas molecules are separated by distance that are larger compared to their size. (Reference: Chang 5.30) 1 Copyright © 2014 by Thomas Edison State College. All rights reserved.

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4. A sample of nitrogen gas kept in a container of volume 2.3 L and at a temperature of
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