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mt1prep - material C p h Joule molK i ice 38.08 water 75.33...

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CHEM 251 Phys. Chemistry for Engineers Winter Semester 2009 Midterm I Preparation Walter Scott [email protected] http://www.chem.ubc.ca/personnel/faculty/scotty/index.shtml UBC Chemistry Department The exam will last 60 minutes. The exam will be closed book. The exam will cover everything up to and including page 2-76. It will include the quizzes and the quiz discussions. The following formulae will be given to you: p + a n V 2 ( V - bn ) = nRT (2.11) p = nRT V - bn - a n V 2 (2.12) 2–13
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There will be nine questions covering: • Harmonic Oscillator • Derivatives and Forces • Thermodynamic Systems, State Variables • The Ideal Gas Law • The Equipartition Theorem • The Law of Partial Pressures • Phase Changes and Latent Heat • The Van der Waals Equation of State • The Boltzmann Distribution 2–14
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2.7 Voluntary Quiz R = 8.315 J K mol = 0.08206 L atm K mol Latent Heat of Water transition L h Joule mol i solid to fluid 6012 fluid to gas 45’000 Heat Capacity
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Unformatted text preview: material C p h Joule molK i ice 38.08 water 75.33 steam 37.47 ‹ 0.1 moles of oxygen are contained in a 5 litre vessel at 200K. Assume that O 2 and N 2 behave ideally. (a) What is the pressure exerted by the gas? (b) We now double the absolute temperature. What is the new pressure in atm ? (c) 0.2 moles of N 2 are added to the vessel in problem a. Calculate the partial pressure of each gas and the total pressure. 2–15 › Assuming that Ar gas obeys the van der Waals equation with a = 1.35 atm L 2 mol 2 and b = 0.0322 L mol , calculate the Ar pressure in atm at 200 K for molar volumes of 1 L mol and 0.1 L mol . NOTE: Modify VdW pressure equation for use with molar volume. fi How much energy is required to heat 2 dL of water from 20 ◦ C to 120 ◦ C steam at constant pressure? NOTE: Don’t forget the latent heat involved in the phase change. 2–16...
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