WA 06_CHE-121-jan18.docx

WA 06_CHE-121-jan18.docx - Name Robert Velat College ID...

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Name: Robert Velat College ID: 0254046 Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: Module 6 Semester and year: JUN2018 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) P 1 V 1 = P 2 V 2 .970 atm 725 mL = .541 atm mL→ .970 atm 725 mL .541 atm = 1300 mL (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) P 1 V 1 = P 2 V 2 1.00 atm 5.80 L = atm 9.65 L→ 1.00 atm 5.80 L 9.65 L = .601 atm x 760 mmHg 1 atm = 456.78 mmHg 457 mmHg (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) The density of a gas is much lower because the molecules are in constant motion and tend to have distances between molecules far greater than a liquid or a solid. Density of gases is typically expressed in g/L (Reference: Chang 5.30) 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 of gas present. (8 points) 1

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