chem3000 - Problem set#2 solutions(Chapters 2-3 First Law...

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Problem set #2 solutions (Chapters 2-3; First Law of Thermodynamics) Due 5 p.m. Friday, September 22 To receive full credit you must attempt to answer every question and you must show your work. You will receive a zero for copying a similar answer from a previous semester’s problem set. You may submit the assignment via ilearn, to the department office (TH 806) or via fax (338-2384). 1) (a) Derive the equation for work of reversible, isothermal expansion of a van der Waals gas from V 1 to V 2 . (b) A mole of CH 4 gas expands reversibly from 1 to 50 L at 25C. Calculate the work done in Joules assuming (1) the gas is ideal and (2) the gas obeys the van der Waals equation. 2) 3.50 moles of an ideal gas are expanded from 450. K and an initial pressure of 5.00 bar to a final pressure of 1.00 bar, and C P,m = 5/2 R. Calculate w for the following two cases: a. The expansion is isothermal and reversible. b. The expansion is adiabatic and reversible. c.
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