Hess's Law

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Felicia1E
Posts: 31
Joined: Fri Sep 28, 2018 12:22 am

Hess's Law

Postby Felicia1E » Wed Jan 23, 2019 4:48 pm

Hey does anyone know what Hess's Law is? Did they go over that in Lavelle's 14A?

Cynthia Ulloa
Posts: 52
Joined: Fri Feb 23, 2018 3:02 am

Re: Hess's Law

Postby Cynthia Ulloa » Wed Jan 23, 2019 4:53 pm

I think this is a topic we will be covering in 14B soon

Raj_Bains_2C
Posts: 66
Joined: Fri Sep 28, 2018 12:25 am
Been upvoted: 1 time

Re: Hess's Law

Postby Raj_Bains_2C » Wed Jan 23, 2019 5:13 pm

We did not go over Hess's Law in 14A and I believe that it will be covered later in the quarter in the thermodynamics outline.

Laura Gong 3H
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Joined: Fri Sep 28, 2018 12:26 am
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Re: Hess's Law

Postby Laura Gong 3H » Wed Jan 23, 2019 5:47 pm

I think we will use Hess's Law solve for the total enthalpy of a reaction. It proves that enthalpy is a state function. (It can be added or subtracted easily because it is not dependent on the reaction's pathway.)

Katelyn Phan 2A
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

Re: Hess's Law

Postby Katelyn Phan 2A » Fri Jan 25, 2019 6:51 pm

Hess's Law is taught in Chem 14B like stated above. It's used to calculate the total enthalpy of the rxn using the separate enthalpies of rxns in between.

Xinyi Zeng 4C
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

Re: Hess's Law

Postby Xinyi Zeng 4C » Fri Jan 25, 2019 7:09 pm

I'm in Lecture 4 and we just went through Hess's Law today during the 3pm lecture. Hess's Law states that enthalpy changes are additive (since enthalpy is a state function). Therefore, enthalpy at each step of a multi-step reaction can be added to give the total enthalpy change.


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