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Unformatted text preview: class. Problem 5. You can calculate Δ S (gas ) if you know V i and V f . 3 5 049884 . 10 300 314 . 8 2 m P nRT V i i i = × × = = 3 5 016628 . 10 4 400 314 . 8 2 m P nRT V f f f = × × × = = Then, K J R K K R V V nR T T C gas S i f i f V / 11 05 . 0166 . ln 2 300 400 ln 2 2 3 ln ln ) ( − = × × + × × × = + = Δ To calculate S (surround ), you need to calculate q . This is an irreversible process. Since the external pressure is 4 bar during the process, you can calculate w if you know Δ V. J V V P w i f ex 4 . 13302 ) 05 . 0166 . ( 10 4 ) ( 5 = − × − = − − = J R T T C U i f V 2 . 2494 100 314 . 8 3 ) 300 400 ( 2 3 2 ) ( = × × = − × = − = Δ J w U q 2 . 10808 4 . 13302 2 . 2494 − = − = − Δ = S (surround) =  q / T = 10808.2 / 400 = 27 J/K...
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This note was uploaded on 09/25/2011 for the course CH 353M taught by Professor Lim during the Fall '08 term at University of Texas at Austin.
 Fall '08
 LIM
 Physical chemistry, pH

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