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Unformatted text preview: U), or are they the same? Explain. 2) We apply a heat source to the piston and measure 70 J transferred to the gases as heat. At the same time the gases expand, doing 30 J of work on the piston. The gases are at the same (new) temperature at the end. What is the change in internal energy ( U) for the 5 moles of Ar? Explain. E Th + E Bond = U U = Q + W KE = (1/2)mv^2 E Bond = 0 for gases. E Th = (1/2)k B T * (total modes) = (1/2)nRT * (modes per molecule) k B = 1.38 x 10-23 J/K R = 8.31 J/(K*mol) Possible types of energy modes for gases: KE trans , KE rot , KE vib , PE vib...
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This note was uploaded on 09/13/2010 for the course PHY 7A 56192 taught by Professor ? during the Winter '09 term at UC Davis.
- Winter '09