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09-gases - Wed | Chapter 5 Gases Gas Stoichiometry Partial...

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1 Week 3 CHEM 1310 - Sections L and M 1 Wed | Sep 12, 2007 Chapter 5: Gases Gas Stoichiometry Partial Pressure Kinetic Theory Effusion and Diffusion Exam #1 - Friday, Sep 14 Attendance is mandatory! Practice exam today in recitation Week 3 CHEM 1310 - Sections L and M 2 PV = n RT THE GASEOUS STATE Pressure atm Volume liters n moles R L atm mol -1 K -1 Temperature Kelvin Ideal Gas Law Earlier… used the Ideal Gas Law to determine mass.
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2 Week 3 CHEM 1310 - Sections L and M 3 PRS Question #1 What mass of argon is contained in an 18.6L container at 20°C if the pressure is 2.35 atm? (1) 21.9 g (2) 72.6 g (3) 322 g (4) 1.82 kg PV = mass (MW) x RT Week 3 CHEM 1310 - Sections L and M 4 What mass of argon is contained in an 18.6L container at 20°C if the pressure is 2.35 atm? (1) 21.9 g (2) 72.6 g (3) 322 g (4) 1.82 kg PRS Question #1- Solution Mass = P x V x MW R x T Mass = (2.35 atm) x (18.6L) x (39.948 g/mol) (0.08206 L atm mol -1 K -1 ) x (293.15K) Mass = 72.6 g What else can be determined using the Ideal Gas Law?
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3 Week 3 CHEM 1310 - Sections L and M 5 PV = n RT Gas Density Ideal Gas Law PV = RT mass (MW) mass V = P (MW) RT = density Week 3 CHEM 1310 - Sections L and M 6 PRS Question #2 What is the density of carbon tetrafluoride at 1.00 atm and 50 ºC? 1) 0.0377 g/L 2) 0.244 g/L 3) 3.32 g/L 4) 21.4 g/L PV = nRT What do we need to do to solve this problem? (1) Know chemical formula (2) Convert Ideal Gas Law into density equation (3) Be mindful of units
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4 Week 3 CHEM 1310 - Sections L and M 7 Gas Density Calculation What is the density of carbon tetrafluoride at 1.00 atm and 50 ºC?
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