CHEM-121_Written Assignment 6 - Thomas Edison State College General Chemistry I with Labs(CHE-121 Section no OL009 Semester and year Feb2019 Written

CHEM-121_Written Assignment 6 - Thomas Edison State College...

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Thomas Edison State College General Chemistry I with Labs (CHE-121) Section no.: OL009 Semester and year: Feb2019 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) T is constant P 1 V 1 = P 2 V 2 → V 2 = P 1 V 1 / P 2 = (7.25 x 0.970) / 0.541 = 1.3 L 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) V 1 = 5.80 L V 2 = 9.65 L P 1 = 1 atm P 2 = P 1 V 1 / V 2 = (5.80 x 1) / 9.65 = 0.60 atm = 0.60 x 760 = 456 mmHg 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) Because gas molecules have a weak intermolecular interaction strength, and have large space between them. Normal units for gas density: g/L 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.
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