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Bond Enthalpies

Posted: Sun Jan 26, 2020 5:21 pm
by Emily Orozco L4
How do we use bond enthalpies to calculate change of enthalpy?

Re: Bond Enthalpies

Posted: Sun Jan 26, 2020 5:31 pm
by Tracy Tolentino_2E
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.

Re: Bond Enthalpies

Posted: Mon Jan 27, 2020 3:53 pm
by Brianna Becerra 1B
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.

Re: Bond Enthalpies

Posted: Mon Jan 27, 2020 3:55 pm
by Alex Tchekanov Dis 2k
You can look at it as the sum of Bonds Broken - the sum of Bonds Formed
This will get you the delta H value.