Calculating deltaH of a reaction at a different temperature

Moderators: Chem_Mod, Chem_Admin

Laura Gong 3H
Posts: 89
Joined: Fri Sep 28, 2018 12:26 am
Been upvoted: 1 time

Calculating deltaH of a reaction at a different temperature

Postby Laura Gong 3H » Mon Feb 11, 2019 2:16 pm

How do you calculate deltaH of a reaction occurring at a different temperature given deltaH of a reaction at another temperature?
Will we need to know this for the midterm?

Jesse Kuehn 1B
Posts: 40
Joined: Wed Nov 14, 2018 12:23 am

Re: Calculating deltaH of a reaction at a different temperature

Postby Jesse Kuehn 1B » Mon Feb 11, 2019 2:33 pm

You would have to be given the different cosntants (bond energies or standard reaction formation enthalpies) associated with that specific temperature difference. I don't think there is a way to calculate the different delta H just using the delta H at one temperature. And i don't think this will be on the mid term

Cameron_Greenberg_3C
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: Calculating deltaH of a reaction at a different temperature

Postby Cameron_Greenberg_3C » Sat Feb 16, 2019 8:59 pm

In this type of problem, the total enthalpy is split into 3 parts: the enthalpy of bringing the reactants from their original temperature to the reaction temperature (modeled by mcdeltaT), the reaction enthalpy at the temperature given, and the enthalpy of bringing the products back to the original temperature (modeled by the same equation). The sum of these three enthalpies will be the total enthalpy.


Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

Who is online

Users browsing this forum: No registered users and 2 guests