Quiz2_Physics241_S09

Quiz2_Physics241_S09 - .g'.3 i j(-2S,O-2J'O):::...

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Quiz 2- 09 February 2009 Name: ----. .,<------- Recitation DaylTime _ 1. a) A quantity of 1.50 moles of ideal diatomic gas (Cy = 5RJ2) is expanded isothermally to three times its initial volume at +25.0 o c. Find Q, Wand AB for this process. (3 points) b) The gas is the cooled at constant pressure to -25.0 o C. Find Q and AB. (2 points) c) The gas is finally heated at constant volume to +75.0 o C. What is the final internal energy? (2 points) C-f) LJ£ = 0 (/$O lh.vYbLt:J. .l ) cp = tv = f 14 V = J F YL. .! T lev ~ IL£ 7 1,,- V"/v; I r V = / ~...s;·o A S2 .~ I )( .2 q g.. J< / I'L. .3i I = 4-.08" x.!05 y . :L. ... .bJ cp =nC pD 7 ::::: ('50>:{Ix.
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Unformatted text preview: .g'.3 i j(-2S,O-2J'O)::: -:l.IS-A)(),) .6 G z nc. . b T = / ---so X{i'&quot; g-.~ I) J... (-;2S'.&quot; -~&quot;o J =--/.r b x IL;~J V ~). ::: ItC V / (~f L:JT) .s ( ..J.-7'3 &quot;t-? J ,&quot;\ / (/ . g. . &quot;'-10 J _ r ' ~ (),A ( 4. . x R-. ~ / ) It '0 J e 2. Two moles of ideal monatomic gas goes from a to b along the diagonal path indicated below at left. Find the change in internal energy ofthe gas. (3 points) 4 --------;;r b 2 -----/ : a: , '------!&quot;-'-. ....... V m 3 2 4 AB=Q-W T K =Tc+ 273 W=PdV AB = nCvilT PV=nRT E=nCyT Cp=Cv+R V rms = {3RT/M} 1/2 K= 3/2kT P = nMv rm sl3V R = 8.31 J/mol.K Q = nCilT...
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