exam1_soln

exam1_soln - Ai e(LS-~\7 Chern 331 Fall 2004 Exam 1 2/6...

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Chern 331, Fall 2004 Ai e(LS-~\7'( Exam 1 2/6 Problem 1: (5 points) Find the work done when an ideal gas with a constant external pressure of 1 atm expands from 10 L to 30 L. Express your answer in Joules. For "onSi-~ t'/. fre.sJU.ej ~ dw~-fu.JV -=3 .jY -f". . ()v w-=- -Q~+I1\)(~i'(bL)= "::120 L.~-h'n -~l'C1~. J~I,315~- ~ /.11< S" , I/. .,,-b. ~ - 2f>Z 1- J Problem 2: (10 points) The enthalpy of vaporization of water at 100°C and 1atm external pressure is 2230 J/mo!. (a). Calculate the entropy change for the vaporization of 1mol of water at 100°C and 1 atm external pressure. '. A - C} wt\Jf-/j i+- For ~ 1) revUJ Ibte 1~,j)L("h~; u~- T -f ? Ip (JS= 223~7/t)iD1-=- 5',Qi L f=or Inw\) (JS::; ),'1f ~ ~ 3i-3.IS""k kmo\ (b) Calculate the entropy change of the surroundings for the reversible vaporization of water at 100°C and constant external pressure of 1 atm. 5{lIu ~ froc-'AJ "" (e,~JI'ble.) \V os -= -fj~SV{( A s - -5',,~iJ LJ Jv{ r - k
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Chern 331, Fall 2004 Exam 1 3/6 Problem 3: Discussion problems (18 points). Choose THREE of the following four questions. Write a brief (:S5 sentences) response to each. In the space provided below, please write CLEARLY the letters of the 3 responses you want me to grade. If it isn't clear to me, 1'11grade the first three responses with writing. Please grade: - (a) What is a state function? Give two examples of a state function and one example of a function that is NOT a state function. A
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This note was uploaded on 09/19/2008 for the course PHYS 2c taught by Professor Wurthmeir during the Spring '05 term at UCSD.

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exam1_soln - Ai e(LS-~\7 Chern 331 Fall 2004 Exam 1 2/6...

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