Hess's Law

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Alexis Robles 2k
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Joined: Wed Sep 18, 2019 12:18 am

Hess's Law

Postby Alexis Robles 2k » Sun Jan 26, 2020 10:22 pm

What is Hess's Law?

Hannah Pham
Posts: 104
Joined: Fri Aug 09, 2019 12:17 am

Re: Hess's Law

Postby Hannah Pham » Sun Jan 26, 2020 10:25 pm

Hess's Law states that regardless of the intermediate steps taken in a reaction, the total enthalpy change for the reaction is the sum of each individual changes.

Niharika 1H
Posts: 50
Joined: Thu Jul 25, 2019 12:16 am

Re: Hess's Law

Postby Niharika 1H » Sun Jan 26, 2020 10:26 pm

Hess's Law is a law that says that the total enthalpy change for a reaction is the sum of all changes in it.

Rhea Shah 2F
Posts: 97
Joined: Thu Jul 25, 2019 12:17 am

Re: Hess's Law

Postby Rhea Shah 2F » Sun Jan 26, 2020 10:32 pm

Since enthalpy is a state function, it can be added and subtracted. This is applied in Hess's law, which states that the total enthalpy change of a reaction is the sum of all the changes in the reaction, regardless of the number of steps taken to obtain the final product.

CalvinTNguyen2D
Posts: 102
Joined: Thu Jul 25, 2019 12:16 am

Re: Hess's Law

Postby CalvinTNguyen2D » Sun Jan 26, 2020 10:38 pm

Hess' Law states that the total enthalpy change of a reaction is the sum of all the individual changes within the reaction!

Julia Holsinger_1A
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Joined: Tue Feb 26, 2019 12:16 am

Re: Hess's Law

Postby Julia Holsinger_1A » Sun Jan 26, 2020 10:57 pm

How can you prove that the total enthalpy change is the sum of the changes in it?

ABombino_2J
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

Re: Hess's Law

Postby ABombino_2J » Sun Jan 26, 2020 10:58 pm

Hess' Law essential proves that enthalpy is a state function because you are allowed to add enthalpies without any regard for how the value was obtained.

Nick Lewis 4F
Posts: 111
Joined: Wed Sep 18, 2019 12:18 am

Re: Hess's Law

Postby Nick Lewis 4F » Sun Jan 26, 2020 11:19 pm

Are there any other laws we have to remember pertaining to this? I know we went over 3 methods to this, but was this the only one given the name of a law?

Shrayes Raman
Posts: 129
Joined: Sat Jul 20, 2019 12:15 am

Re: Hess's Law

Postby Shrayes Raman » Sun Jan 26, 2020 11:47 pm

It has to do with state functions and how they relate to enthalpy, as enthalpy is not determined by path taken.


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