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e 115
Engineering Thermodynamics
Fall 2009
University of California
Problem set 4
Due:
Friday, September 11
th
, in lecture
1.
(20 points)
In thermodynamics, one often develops general relationships and from these, equations that apply to
idealized materials are derived. The ideal gas represents one such idealized system. For an ideal
monatomic
gas, the heat capacity at constant volume is independent of temperature and equals
3
2
R
,
where R is the gas constant. If the gas is polyatomic, then although the gas may obey the ideal gas
law, the heat capacity can vary with temperature. Real gases will generally deviate from the ideal gas
law, particularly at low temperatures and high pressures, and can have a heat capacity that varies with
temperature. Describing such systems accurately is thus more difficult. This problem is intended to
compare what happens when a process is conducted on a monatomic ideal gas, and a polyatomic ideal
gas with a temperature dependent heat capacity.
One mole of an ideal gas initially at 800K is expanded from an initial volume of 6.57 liters and
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This note was uploaded on 02/12/2011 for the course E 115 taught by Professor Staff during the Fall '08 term at University of California, Berkeley.
 Fall '08
 Staff
 Dynamics

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