## Van't Hoff Equation

$\Delta G^{\circ}= \Delta H^{\circ} - T \Delta S^{\circ}$

$\Delta G^{\circ}= -RT\ln K$

$\Delta G^{\circ}= \sum \Delta G_{f}^{\circ}(products) - \sum \Delta G_{f}^{\circ}(reactants)$

Katie Bart 1I
Posts: 104
Joined: Sat Aug 24, 2019 12:16 am

### Van't Hoff Equation

When do you use the Van't Hoff Equation? And how does it relate to Gibbs Free Energy?

Brian Tangsombatvisit 1C
Posts: 119
Joined: Sat Aug 17, 2019 12:15 am

### Re: Van't Hoff Equation

You use the Van't Hoff equation to find a different K at a different temperature if the enthalpy of a reaction is known. Using the equation, you plug in all the values you are given (K1, H, T1 and T2) to find K2. Or you can be given K2 instead of T2 and use the equation to find T2.

Naji Sarsam 1F
Posts: 104
Joined: Sat Aug 17, 2019 12:18 am

### Re: Van't Hoff Equation

The Van't Hoff Equation is derived from two expressions for Gibbs Free Energy.

Sally Qiu 2E
Posts: 105
Joined: Fri Aug 30, 2019 12:18 am

### Re: Van't Hoff Equation

van't hoff equation is used to find the K value for different temperatures

Justin Quan 4I
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Joined: Sat Sep 14, 2019 12:17 am

### Re: Van't Hoff Equation

You use the Van 't Hoff equation why you are asked to relate the change in the equilibrium constant, K, of a chemical reaction to the change in temperature, T. The question will likely give you the standard enthalpy change, ΔH, and ask for K, or vice versa.

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