Constants


Moderators: Chem_Mod, Chem_Admin

Caroline Cox 1H
Posts: 18
Joined: Fri Sep 29, 2017 7:03 am

Constants

Postby Caroline Cox 1H » Sun Feb 04, 2018 8:10 pm

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

Anh Nguyen 2A
Posts: 36
Joined: Fri Sep 29, 2017 7:05 am
Been upvoted: 1 time

Re: Constants

Postby Anh Nguyen 2A » Sun Feb 04, 2018 8:16 pm

Because the values of enthalpy and entropy at different temperature are different but the difference between the final value and initial value is the same no matter what the temperature so we can assume that deltaH and deltaS are constant at different temperature.

Ilan Shavolian 1K
Posts: 58
Joined: Fri Sep 29, 2017 7:03 am

Re: Constants

Postby Ilan Shavolian 1K » Sun Feb 04, 2018 8:43 pm

im pretty sure since they are state functions, they can be considered constant

nathansalce 3e
Posts: 52
Joined: Thu Jul 27, 2017 3:01 am

Re: Constants

Postby nathansalce 3e » Mon Feb 05, 2018 5:18 pm

Technically, we do not assume that deltaH and deltaS are constants... but rather we assume the difference in deltaH and deltaS between the two equations (for the two temperatures) is the same.Thus, we say that the rate at which H and S change is not the same, but the difference between the two values is the same at both temperatures, allowing us to compare other values at the two temperatures.

Abby Ellstrom 1I
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

Re: Constants

Postby Abby Ellstrom 1I » Thu Feb 08, 2018 6:08 pm

The change in enthalpy and entropy does not change between different temperatures in this equation so they can be treated as constant.


Return to “Van't Hoff Equation”

Who is online

Users browsing this forum: No registered users and 1 guest