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Course: CHEM 254, Fall 2009School: W. Alabama
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Examination Midterm CHEM 254 Question #1: (45%) Monday, March 4th, 2002 One mole of gas is taken from state 2 (P2, T2 = 250 K, V 2 ) to state 1 (P1 = 105 Pa, T1 = 298 K, V 1 ) adiabatically. This same mole of gas is then taken from state 1 (P1 = 105 Pa, T1 = 298 K, V 1 ) to state 3 (P3, T3 = T1 = 298 K, V 3 = 2 V 1 ) isothermally. 1.a) Determine V 1 , P2, V 2 , P3 and V 3 . 1.b) Calculate S 23 . 1.c) Calculate...
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Examination Midterm CHEM 254 Question #1: (45%)
Monday, March 4th, 2002
One mole of gas is taken from state 2 (P2, T2 = 250 K, V 2 ) to state 1 (P1 = 105 Pa, T1 = 298 K, V 1 ) adiabatically. This same mole of gas is then taken from state 1 (P1 = 105 Pa, T1 = 298 K, V 1 ) to state 3 (P3, T3 = T1 = 298 K, V 3 = 2 V 1 ) isothermally. 1.a) Determine V 1 , P2, V 2 , P3 and V 3 . 1.b) Calculate S 23 . 1.c) Calculate w13 . 1.d) Calculate q1 2 .
Question #2: (25%) Using the following table, calculate the entropy change of water when one mole of water at 10 oC is brought to vapor at 120 oC. vap H
kJ. P mol1
C (liquid)
J.mol .K
1 1
C P (gas)
J.mol .K
1
1
o
Tb C
75.3
33.6
100
40.7
Question #3: (30%) 3.a) Using dU, find an expression of dS for an ideal gas as a function of CV, T, P and V.
S 3.b) Using the expression of dS derived in 3.b), determine . V T
3.c) Determine S when one mole of ideal gas is expanded at constant temperature fr...
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W. Alabama - CHEM - 254
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W. Alabama - CHEM - 254
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