Bond Enthalpies

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Emily Orozco L4
Posts: 45
Joined: Fri Sep 28, 2018 12:29 am

Bond Enthalpies

Postby Emily Orozco L4 » Sun Jan 26, 2020 5:21 pm

How do we use bond enthalpies to calculate change of enthalpy?

Tracy Tolentino_2E
Posts: 140
Joined: Sat Sep 07, 2019 12:17 am

Re: Bond Enthalpies

Postby Tracy Tolentino_2E » Sun Jan 26, 2020 5:31 pm

Bond enthalpies can be used to calculate the net enthalpy change.
For the reactants, bond energies are positive because it takes energy for bonds to break. For products, energy is negative because when bonds form, energy is released. We then add all the energy values to gain the net enthalpy change.

Brianna Becerra 1B
Posts: 117
Joined: Fri Aug 02, 2019 12:16 am

Re: Bond Enthalpies

Postby Brianna Becerra 1B » Mon Jan 27, 2020 3:53 pm

The specific bond enthalpy values to use in calculating the net change is either given or can be found on a table by locating the specific bond formation or breakage and taking this number and applying it as a positive for reactants and a positive for reactants and then adding them all together.

Alex Tchekanov Dis 2k
Posts: 118
Joined: Sat Aug 24, 2019 12:16 am

Re: Bond Enthalpies

Postby Alex Tchekanov Dis 2k » Mon Jan 27, 2020 3:55 pm

You can look at it as the sum of Bonds Broken - the sum of Bonds Formed
This will get you the delta H value.

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