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Topic: thermodynamics ques on partial molar volumes  (Read 6091 times)

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Offline Hookes Law

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thermodynamics ques on partial molar volumes
« on: October 15, 2006, 01:27:06 PM »
hi, i atttached my question. any help would be great. thanks guys  :)
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Offline Donaldson Tan

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Re: thermodynamics ques on partial molar volumes
« Reply #1 on: October 15, 2006, 09:16:41 PM »
Use the Gibbs Duhem Relation at fixed P & T to solve it.
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Offline Hookes Law

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Re: thermodynamics ques on partial molar volumes
« Reply #2 on: October 16, 2006, 07:13:03 PM »
thats what i did but then i have V2 equal a cubic equation in x2, which is ok, however theres also an unknown V, which i somehow need to evaluate using the density given. but i dunno how
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Offline Donaldson Tan

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Re: thermodynamics ques on partial molar volumes
« Reply #3 on: October 17, 2006, 03:34:30 PM »
Gibbs-Duhem Relation at fixed P&T for binary mixture:

n1d?1 + n2d?2 = 0
n1d?1 = - n2d?2
d?1/d?2 = -n2/n1

note: x1 + x2 = 1
-n2/n1 = -x2/x1 = x2/(x2 - 1)

d?1/d?2 = V1/V2 = x2/(x2 - 1)

V1 = 92.6 - 5.28x1 + 2.64x12 = 92.6 + 5.28(x2 - 1) + 2.64(x2 - 1)2

V2 = V1(x2 - 1)/x2 = 89.96(1 - 1/x2) + 2.64x2(x2 - 1)
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"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006
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