2007 - answers

2007 - answers - Chemistry 203 Answers Midterm II, Nov. 12,...

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Chemistry 203 – Answers Midterm II, Nov. 12, 2007 1. i) lowest S Tran : H 2 O(g); smallest mass ii) highest S Tran : Br 2 (g); largest mass iii) lowest S vibr : Ar(g); no vibrations iv) highest S vibr : C 4 H 10 (g); 3n-6 = 36 vibr., Br 2 closer to the H-T limit but only 1 vibr. involved. v) lowest overall: Ar(g), no rotational or vibrational degrees of freedom 2. (a) DNA; C p = 0: ( 29 ( 29 1 mol kJ 110 - = = m o den o den T H T H ( 29 ( 29 ( 29 K mol kJ 110 T T H T S T S 1 m m o den m o den o den 347 - = = = 1 1 K mol 0.317kJ - - = ( 29 1 1 1 o den K mol kJ Kx mol kJ 110 G K - - - - = 317 . 0 310 310 1 11.73kJmol - = K x Jmol x K e K 310 314 . 8 10 73 . 11 310 1 3 - - = = 0.0106 ( 29 ( 29 1 mol kJ 110 - = = m o den o den T H H K 270 ( 29 ( 29 ( 29 1 1 K mol 0.317kJ - - - = = = = K mol kJ 110 T T H T S S 1 m m o den m o den o den K 347 270 ( 29 1 1 1 o den K mol kJ Kx mol kJ 110 G K - - - - = 317 . 0 270 270 = 24.4 kJ mol -1 K -1 K x Jmol x K e K 270 314 . 8 10 73 . 11 270 1 3 - - = = 1.89 x 10 -5 Protein, C P = 3 kJ mol -1 K -1 ( 29 ( 29 ( 29 m P m o den o den T - T C T H T H + = ( 29 ( 29 1 mol kJ 17 - - - - + = - + = K K K mol kJ mol kJ 140 K H 1 1 o den 351 310 0 . 3 310 1 ( 29 1 1 K kJmol 0.0262 - - - - - + = + = K K n K mol kJ K mol kJ 140 S 1 1
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This note was uploaded on 07/24/2011 for the course CHEM 203 taught by Professor Galley during the Fall '09 term at McGill.

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2007 - answers - Chemistry 203 Answers Midterm II, Nov. 12,...

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