Van't Hoff equation


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Felicia Fong 2G
Posts: 31
Joined: Sat Jul 22, 2017 3:00 am

Van't Hoff equation

Postby Felicia Fong 2G » Tue Feb 13, 2018 10:27 pm

Because the Van't Hoff equation isn't given on the formula sheet can you use this method?
1. given standard entropy and enthalpy of reaction, solve for delta G using delta(G) = delta(H) - Tdelta(S)
2. Solve for k(equilibrium constant) using delta(G)=-RTlnk

Curtis Wong 2D
Posts: 62
Joined: Sat Jul 22, 2017 3:00 am

Re: Van't Hoff equation

Postby Curtis Wong 2D » Tue Feb 13, 2018 10:41 pm

I would imagine so. Isn't the Van't Hoff equation broken down into those two equations that you mentioned? So I feel like it would be ok.

Phillip Winters 2F
Posts: 50
Joined: Fri Sep 29, 2017 7:05 am

Re: Van't Hoff equation

Postby Phillip Winters 2F » Sat Feb 17, 2018 11:54 pm

Yes you can do this, but you can always just derive the Van't Hoff equation from deltaG=deltaH -t*deltaS

Xin He 2L
Posts: 38
Joined: Fri Sep 29, 2017 7:05 am

Re: Van't Hoff equation

Postby Xin He 2L » Sun Feb 18, 2018 1:20 am

You can derive them from those two equations, but you have to remember to subtract the values at the first temp, equilibrium constant from the second equilibrium constant. It's probably easier to remember it than derive it.

Cassandra Mullen 1E
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Joined: Fri Sep 29, 2017 7:07 am
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Re: Van't Hoff equation

Postby Cassandra Mullen 1E » Sun Mar 04, 2018 10:10 pm

You can derive the equation by substituting ∆G˚=-RTlnk into ∆G˚=∆H˚-T∆S˚ to get -RTlnk =∆H˚-T∆S and then dividing both sides by -RT.


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