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Bond enthalpy

Posted: Thu Jan 30, 2020 12:36 pm
how do we use bond enthalpies to calculate ΔH? and was that the least inaccurate method?

Re: Bond enthalpy

Posted: Thu Jan 30, 2020 1:28 pm
using bond enthalpies to calculate delta h is the least accurate method, but to do so you would be given the bond enthalpies of the products/reactants and you would plug them into the equation we are given

Re: Bond enthalpy

Posted: Thu Jan 30, 2020 1:51 pm
$\Sigma \Delta H_(Bonds broken) - \Sigma \Delta H(Bondsformed)$. You add up the bond enthalpies from the product side and subtract it from the sum of the bond enthalpies of the reactant side. Also remember to take into account the stoichometric values in your math.
You are right that it is the least accurate method.