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 wscott@chem.ubc.ca 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 ² n V ³ 2 ´ ( V - bn ) = nRT (2.11) p = nRT V - bn - a ² n V ³ 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. 215 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. How much energy is required to heat 2 dL of water from 20 C to 120 C steam at constant pressure? NOTE: Dont forget the latent heat involved in the phase change. 216...
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This note was uploaded on 12/05/2010 for the course CHBE 251 taught by Professor Scotty during the Winter '09 term at The University of British Columbia.

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

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