Vant Hoff Equation vs dG = -RTln(K)

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Cole Woulbroun 1J
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Joined: Thu Jul 25, 2019 12:16 am

Vant Hoff Equation vs dG = -RTln(K)

Postby Cole Woulbroun 1J » Sat Feb 22, 2020 1:46 pm

Before doing problem 5.55, I was under the impression that when you had a temperature that wasn't 298.15 K, you used the Vant Hoff Equation to determine the equilibrium constant since it accounts for the effect that a temperature change has on Kc. But in 5.55 the dG = -RTln(K) was used. What is the explanation for this? How do you know which of these equations to use when finding a K that is not at 298.15K?

Shivam Rana 1D
Posts: 106
Joined: Fri Aug 09, 2019 12:16 am

Re: Vant Hoff Equation vs dG = -RTln(K)

Postby Shivam Rana 1D » Sat Feb 22, 2020 2:10 pm

You will have a different K at different temperatures since the equilibrium concentrations vary with temperature.

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