"Sign" use for Standard Reaction Enthalpy

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Amber Ligason-Tiquia1G
Posts: 11
Joined: Fri Sep 25, 2015 3:00 am

"Sign" use for Standard Reaction Enthalpy

Postby Amber Ligason-Tiquia1G » Sun Jan 31, 2016 3:58 pm

When calculating the standard reaction enthalpy of an equation, how do we know when to use the "+" or "-" sign? Thank you.
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Amanda Reshke 1D
Posts: 17
Joined: Fri Sep 25, 2015 3:00 am

Re: "Sign" use for Standard Reaction Enthalpy

Postby Amanda Reshke 1D » Sun Jan 31, 2016 4:10 pm

For Hess' law if you reverse a chemical equation you switch the sign on the enthalpy for that equation, and when you're not using Hess' law you do deltaH(Prod)-deltaH(React)
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