WA06_CHE-121-mar14

# WA06_CHE-121-mar14 - Written Assignment 6 Gases Answer all...

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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) (Reference: Chang 5.19) V2 = 725 mL x .970 atm / .541 atm =1299.91 mL 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) (Reference: Chang 5.21) 5.80 L = P2 x 9.65 L 5.80 / 9.65 = P2 P2 = .601 .601 x 760 = 456.788mmHg 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) (Reference: Chang 5.30) As matter shifts though the spectrum (from solid to gas) the particles spread, which is what causes them to lose their solidarity and density. Gases are usually expressed in L, mL , cm 3 , dm 3 , or m 3 4. A sample of nitrogen gas kept in a container of volume 2.3 L and at a temperature of 32°C exerts a pressure 4.7 atm. Calculate the number of moles

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