Hess's Law  [ENDORSED]

Moderators: Chem_Mod, Chem_Admin

Jesse_torres2H
Posts: 41
Joined: Thu Jul 27, 2017 3:00 am

Hess's Law

Postby Jesse_torres2H » Wed Jan 24, 2018 3:32 pm

For questions involving Hess's law are we going to be given the reactions involved or are we going to have to write them ourselves?

Anna Okabe
Posts: 30
Joined: Fri Sep 29, 2017 7:06 am

Re: Hess's Law

Postby Anna Okabe » Wed Jan 24, 2018 3:41 pm

I'm sure it will depend on the question, but I think most questions will give us the reactions with the reaction enthalpies.

Eli Aminpour 2K
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

Re: Hess's Law

Postby Eli Aminpour 2K » Wed Jan 24, 2018 3:55 pm

From what I've seen, we will be given a few steps or reactions and their enthalpy's and the final reaction. Then the question will ask us for the enthalpy change of the final reation.

Brigitte Phung 1F
Posts: 50
Joined: Thu Jul 27, 2017 3:00 am
Been upvoted: 1 time

Re: Hess's Law

Postby Brigitte Phung 1F » Wed Jan 24, 2018 4:19 pm

I agree, while the questions may differ on what they ask for using the final reaction, the problems should give the additional reactions and enthalpies we'll need to complete the final reaction.

Jessica Benitez 1K
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

Re: Hess's Law

Postby Jessica Benitez 1K » Fri Jan 26, 2018 11:26 pm

I agree that it will depend on the question and what we've covered in class. I feel like for the most part we would be given the reactions we need and the one we are looking for however there was a homework problem where we needed to know the combustion equations.

Jesus Rodriguez 1J
Posts: 53
Joined: Sat Jul 22, 2017 3:00 am

Re: Hess's Law

Postby Jesus Rodriguez 1J » Sat Jan 27, 2018 2:32 pm

For the most part, we are usually given anything that is needed to solve that problem whether directly or indirectly given to us.

Justin Bui 2L
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am

Re: Hess's Law

Postby Justin Bui 2L » Mon Jan 29, 2018 1:24 am

Yeah, seems like we often don't have to memorize a lot of things just for the sake of memorizing them. Instead, we're given pieces and necessary info: the enthalpies and reactions to reach the final reaction and get its enthalpy and that demonstrates our understanding.

Morgan Baxter 1E
Posts: 50
Joined: Thu Jul 27, 2017 3:00 am

Re: Hess's Law  [ENDORSED]

Postby Morgan Baxter 1E » Mon Jan 29, 2018 8:55 am

I think either type of question can be asked. He can either give us the equation, or lets say there is a problem on the change in enthalpy of combustion, we would be expected to know how to write and balance the equations of combustion that correspond to the enthalpy of combustion data we are given.


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 1 guest