Bond enthalpies to calculate change in enthalpy

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AlyssaPeckham1A
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Joined: Fri Sep 29, 2017 7:04 am

Bond enthalpies to calculate change in enthalpy

Postby AlyssaPeckham1A » Fri Mar 16, 2018 2:18 pm

Could someone explain how to use bond enthalpies to calculate the change in enthalpy of a reaction?

Jessica Jones 2B
Posts: 80
Joined: Fri Sep 29, 2017 7:04 am

Re: Bond enthalpies to calculate change in enthalpy

Postby Jessica Jones 2B » Fri Mar 16, 2018 2:37 pm

You would use the (deltaH of bonds broken - deltaH of bonds formed). In order to figure out which bonds are broken and formed you look at the lewis structures. You could just break every bond in reactants and from every bond in the products if that is easier for you.

Eunice Lee 1A
Posts: 60
Joined: Wed Oct 03, 2018 12:16 am

Re: Bond enthalpies to calculate change in enthalpy

Postby Eunice Lee 1A » Sat Jan 26, 2019 1:10 pm

You would need the enthalpy of each bond in the reaction broken and each bond in the reaction formed. Add these values together to get the total change in enthalpy.

Emily Huang 1E
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

Re: Bond enthalpies to calculate change in enthalpy

Postby Emily Huang 1E » Sat Jan 26, 2019 1:17 pm

You would determine the change in phases and find the bond enthalpy. You subtract the bond enthalpy of the reactants from the bond enthalpy of the products


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