Hess's Law

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Karina Kong 2H
Posts: 98
Joined: Thu Jul 25, 2019 12:16 am

Hess's Law

Postby Karina Kong 2H » Sun Jan 26, 2020 11:43 pm

Can someone explain Hess's Law?

Charisse Vu 1H
Posts: 101
Joined: Thu Jul 25, 2019 12:17 am

Re: Hess's Law

Postby Charisse Vu 1H » Sun Jan 26, 2020 11:46 pm

Hess's Law states that enthalpy change at each step of a reaction can be added together to give a total enthalpy change because enthalpy is a state function and is therefore additive.

Martina
Posts: 111
Joined: Thu Jul 25, 2019 12:16 am

Re: Hess's Law

Postby Martina » Sun Jan 26, 2020 11:58 pm

Enthalpy is a state function, meaning that only the beginning and endpoints matter, not the path taken or the intermediate values. For this reason enthalpy is additive.

Matthew Chan 1B
Posts: 111
Joined: Sat Sep 07, 2019 12:16 am

Re: Hess's Law

Postby Matthew Chan 1B » Sun Jan 26, 2020 11:59 pm

Hess's Law states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes

205154661_Dis2J
Posts: 109
Joined: Wed Sep 18, 2019 12:21 am

Re: Hess's Law

Postby 205154661_Dis2J » Mon Jan 27, 2020 12:00 am

Similarly to the former statement, Hess' law allows us to combine equations to generate new rxns whose enthalpy change can be calculated, since it is a state function.

Brian J Cheng 1I
Posts: 115
Joined: Thu Jul 11, 2019 12:15 am

Re: Hess's Law

Postby Brian J Cheng 1I » Mon Jan 27, 2020 12:26 am

Hess's Law encompasses all enthalpy changes that accompany a general reaction no matter how many intermediate steps said reaction has. Each individual change in enthalpy is taken into account.


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