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### Van't Hoff equation

Posted: **Tue Feb 13, 2018 10:27 pm**

by **Felicia Fong 2G**

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

### Re: Van't Hoff equation

Posted: **Tue Feb 13, 2018 10:41 pm**

by **Curtis Wong 2D**

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.

### Re: Van't Hoff equation

Posted: **Sat Feb 17, 2018 11:54 pm**

by **Phillip Winters 2F**

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

### Re: Van't Hoff equation

Posted: **Sun Feb 18, 2018 1:20 am**

by **Xin He 2L**

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.

### Re: Van't Hoff equation

Posted: **Sun Mar 04, 2018 10:10 pm**

by **Cassandra Mullen 1E**

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.