usage

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

Sophia Dinh 1D
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

usage

what is the van’t hoff equation used for?

ayushibanerjee06
Posts: 177
Joined: Thu Jul 11, 2019 12:16 am
Been upvoted: 1 time

Re: usage

you can use it to find either: K1, K2, delta H, T1, or T2

AJForte-2C
Posts: 89
Joined: Wed Sep 30, 2020 10:00 pm
Been upvoted: 1 time

Re: usage

I know in lecture he said that it could be used for calculating k at different temperatures if standard enthalpy is known, but can anyone give some more specifics on how to find other variables with this equation?

Taylor Newville 1C
Posts: 36
Joined: Wed Nov 18, 2020 12:21 am

Re: usage

The equation
lnK=−ΔHo/RT + −ΔSo/R
can be used to find the temperature dependency of K. How K increases or decreases with temperature is linked to whether the reaction enthalpy is positive or negative.
This is because the modified version of the equation
ln(K2/K1)=−ΔHo/R(1/T2−1/T1)
can be used to find any of the missing variables in the equation. For example, if you know ΔHo, K1, T2, and T1, then you can calculate K2.

Lisa Wang 3B
Posts: 102
Joined: Wed Sep 30, 2020 9:51 pm

Re: usage

The equation, when given the other components, can be used to find delta H, T, delta S, and K. In some circumstances, you can use n*delta H = q or delta G = -RTlnK in conjunction to help you.

Siwa Hwang 3G
Posts: 84
Joined: Wed Sep 30, 2020 9:48 pm

Re: usage

You can use it to find different components of the reaction such as delta H and K when Temperature changes.

Posts: 39
Joined: Thu Dec 17, 2020 12:18 am

Re: usage

The Van't Hoff equation is typically used to calculate K at a different temperature if the change in standard enthalpy is known. However, I suppose we could also use it to calculate any of the other values in the equation if we had enough information.

Joshua Swift
Posts: 85
Joined: Wed Sep 30, 2020 9:50 pm

Re: usage

It is usually used to calculate K, but if given enough of the other variables in the problem you could rearrange the equation to solve for an unknown.

Nick Saeedi 1I
Posts: 102
Joined: Wed Sep 30, 2020 9:39 pm

Re: usage

it can be used to solve for the enthalpy change or K depending on the information given.

Dane_Beasley_1E
Posts: 68
Joined: Wed Sep 30, 2020 9:42 pm

Re: usage

It can be used to find the enthalpy, temperature, or the K.

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