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Unformatted text preview: R. (2.0 pts) Says that H_2 has a greater change in internal energy because it has more modes per molecule. Also give for other major errors. S. (1.0 pts) Wrong. Sometimes given even if the answer given was Ar but the explanation was completely wrong, ie. Ar because it has fewer modes per molecule. X. Q) (3.0 pts) Delta U = 70-30 = 40J for the entire system. That energy gets split between the Ar and the H_2. Ar has 3 modes/molecule and 5 moles. H_2 has 5 modes/molecule and 1 mole. So Ar gets 3*5/(3*5+5*1) * Delta U= 3/4 * Delta U_Ar = 30J. 2. (2.5 pts) Delta U = 70+30 = 100J (This is wrong). Delta U_Ar = 100*3/4 = 75J R. (2.0 pts) Understood that the energy should be split between Ar and H_2, but didn’t fully understand how, ie Delta U_Ar = 5 / 6 Delta U S. (1.0 pts)At least got Delta U = Q + W = 70 - 30 = 40J T. (0.7 pts) At least wrote down Delta U = Q + W somewhere. V. X) (0.5 pts) Wrong....
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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