Bond Enthalpies

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Katelyn 2E
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Bond Enthalpies

Postby Katelyn 2E » Tue Jan 16, 2018 11:46 am

For bond enthalpies, I was wondering how we know which bonds to exclude from our calculations. Is it just the ones that repeat in the reactants and the products?

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Re: Bond Enthalpies

Postby MorganYun1H » Tue Jan 16, 2018 12:02 pm

You only include the bonds that change at the reaction goes, so yes exclude those that stay the same in reactants and products.

Anna Goldberg 2I
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Re: Bond Enthalpies

Postby Anna Goldberg 2I » Tue Jan 16, 2018 12:32 pm

Keep in mind, as in question 8.73 c), the compounds may rearrange into different compounds, but the bonds between the elements remain the same. The reaction enthalpy is zero in situations such as this.

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