set3 - Chem 3433 Problem Set 3 Due before class on 1 A...

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Chem 3433 – Problem Set 3 Due before class on 9/14/11 1. A perfect gas undergoes an expansion process at constant pressure. Does its internal energy increase, decrease or remain the same? Why? 2. Four (4.00) moles of a perfect gas at 300.0 K and 1.00 bar pressure undergo a reversible isothermal compression until the pressure becomes 4.00 bar. Calculate: q, w, U and H. 3. The virial equation of Ar at 273 K has B = -21.7 cm 3 /mol and C = 1200 cm 6 /mol 2 . Assume the rest of the coefficients are zero. Calculate (a) work of isotherm expansion against a constant pressure of 1 atm, and (b) the work of reversible, isotherm expansion on the assumption that Ar behaves perfectly. For this problem V i = 500 cm 3 , V f = 1000 cm 3 and n=1 mol. 4. Three moles of a perfect gas at 200.0 K and 2.00 bar pressure undergo a reversible adiabatic compression until the temperature becomes 250 K. For the gas, C v per mol is 27.5 J/(K mol) over this temperature range. Calculate: q, w, V f , P f (in bars),

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set3 - Chem 3433 Problem Set 3 Due before class on 1 A...

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