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reaction enthalpies

Posted: Sat Jan 13, 2018 4:28 pm
by Lindsay H 2B
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?

Re: reaction enthalpies

Posted: Sat Jan 13, 2018 4:35 pm
by Manvir2K
Since enthalpy is a state function, all one has to do is change the sign in the reverse reaction.

Re: reaction enthalpies

Posted: Sun Jan 14, 2018 11:50 am
by skalvakota2H
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.

Re: reaction enthalpies

Posted: Sun Jan 14, 2018 6:36 pm
by Phi Phi Do 2E
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.