## Van't Hoff equation

$\ln K = -\frac{\Delta H^{\circ}}{RT} + \frac{\Delta S^{\circ}}{R}$

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

### Van't Hoff equation

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

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

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

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
Posts: 54
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 2 times

### Re: Van't Hoff equation

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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