reaction enthalpies

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Lindsay H 2B
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reaction enthalpies

Postby Lindsay H 2B » Sat Jan 13, 2018 4:28 pm

for any reaction with a given reaction enthalpy, is the enthalpy of the reverse reaction always just found by changing the sign of the forward reaction?

Manvir2K
Posts: 32
Joined: Fri Sep 29, 2017 7:05 am

Re: reaction enthalpies

Postby Manvir2K » Sat Jan 13, 2018 4:35 pm

Since enthalpy is a state function, all one has to do is change the sign in the reverse reaction.

skalvakota2H
Posts: 52
Joined: Sat Jul 22, 2017 3:01 am

Re: reaction enthalpies

Postby skalvakota2H » Sun Jan 14, 2018 11:50 am

The sign does change in a reverse reaction. The reasoning is that since enthalpy is a state function, the energy required to push a forward reaction to its products would be directly reversed to push it back to its reactants.

Phi Phi Do 2E
Posts: 27
Joined: Fri Sep 29, 2017 7:05 am

Re: reaction enthalpies

Postby Phi Phi Do 2E » Sun Jan 14, 2018 6:36 pm

You only need to change the sign because the destinations are reversed now. Point B goes back to point A as opposed to the forward reaction. This only causes a sign change because enthalpy is a state function and only depends on the state of the reaction and disregards the path.


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