Constants


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FrankieClarke2C
Posts: 59
Joined: Fri Sep 28, 2018 12:28 am

Constants

Postby FrankieClarke2C » Thu Feb 28, 2019 4:52 am

why we can assume that deltaH and deltaS are constant when using the Van't Hoff equation to calculate K at different temperatures?

Venya Vaddi 1L
Posts: 96
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 2 times

Re: Constants

Postby Venya Vaddi 1L » Thu Feb 28, 2019 5:18 am

I think we are just assuming that they are independent of temperature so that we can use those values at two different temperatures in the calculations to solve for K values when temperature changes.

JacobHershenhouse3G
Posts: 32
Joined: Thu Jan 10, 2019 12:17 am

Re: Constants

Postby JacobHershenhouse3G » Thu Feb 28, 2019 5:25 am

When you're solving for k at different temperatures, you're going to be using standard enthalpy and entropy values, so these dont change based on temperature. Thinking back to the first midterm though, we can remember that k does depend on temperature so that's how this concept can be applied to thermochemistry

Roberto Gonzalez 1L
Posts: 39
Joined: Fri Sep 28, 2018 12:17 am

Re: Constants

Postby Roberto Gonzalez 1L » Sun Mar 17, 2019 5:45 pm

As the Van't Hoff Equation is used when the temperature is different for a given reaction, the change in enthalpy and entropy for the reaction remains the same as they are independent of temp and therefore t is the only variable that is different in two situations (where t1 is raised or lowered to t2).


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