bond enthalpies

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Stephanie tran 1J
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

bond enthalpies

Postby Stephanie tran 1J » Tue Jan 30, 2018 5:39 pm

Can someone provide an example of how to estimate the enthalpy of a reaction using mean bond enthalpies and explain the difference between this calculation and when given the bond enthalpies of the products, but not the reactants?

MorganYun1H
Posts: 59
Joined: Thu Jul 13, 2017 3:00 am

Re: bond enthalpies

Postby MorganYun1H » Tue Jan 30, 2018 6:44 pm

I'm not entirely sure what you mean by "when they give you bond enthalpies of only the products", but the enthalpy of a reaction can be calculated by subtracting

the sum of the bonds broken (reactants) - the sum of the bonds formed (products)

the bond enthalpies are the enthalpies for each bond that is broken or formed. You just have to match them up. If that makes sense.

Renee Delamater 2H
Posts: 31
Joined: Wed Nov 16, 2016 3:02 am

Re: bond enthalpies

Postby Renee Delamater 2H » Wed Jan 31, 2018 10:06 pm

These values are always given - we do not need to memorize them.

CalebBurns3L
Posts: 47
Joined: Fri Sep 29, 2017 7:07 am

Re: bond enthalpies

Postby CalebBurns3L » Fri Feb 02, 2018 12:39 pm

The values will always be provided, and it is always bonds broken - bonds formed.


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