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Topic: Thermodynamics - Gibbs-energy  (Read 2019 times)

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Offline LMW

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Thermodynamics - Gibbs-energy
« on: December 05, 2012, 02:18:07 PM »
Hey guys i have calculated the Gibbs-energy for the attached reaction. I have also attached the table where the Gibbs-energy can be seen for the reactans and products. My question is is it true that Gibbs-energi is 631,39 kj/mol and therefore the reaction isn't spontaneous? Thanks in advance.

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Offline curiouscat

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Re: Thermodynamics - Gibbs-energy
« Reply #1 on: December 05, 2012, 02:37:15 PM »
Yes, I checked your arithmetic.  ::)
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Offline LMW

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Re: Thermodynamics - Gibbs-energy
« Reply #2 on: December 05, 2012, 03:45:19 PM »
Sorry here is my arithmetic:

((7*137,25))-((8,09+7*(-228,6))= 631,36 kj/mol and therefore the reaction isn't spontaneous.
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Offline LMW

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Re: Thermodynamics - Gibbs-energy
« Reply #3 on: December 05, 2012, 03:52:26 PM »
I have more questions if that's i hope that's ok, its still the same reaction:

The reaction reacts at a higher temperature when Kp=5,69*10^8 Bar^14

Calculate the temperature when the reaction will proceed. Is my calculation right? I have attached it. I have used Van't Hoffs equation and the result i got is 775,50 K.
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Offline LMW

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Re: Thermodynamics - Gibbs-energy
« Reply #4 on: December 06, 2012, 08:28:31 AM »
Anyone who can help? :p
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