delta H of reaction

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delta H of reaction

Postby 005199302 » Tue Mar 12, 2019 4:41 pm

When given delta H of a reaction, I'm confused as to when you multiply and when you divide delta H by the amount of moles of a reactant

Jesse Kuehn 1B
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Re: delta H of reaction

Postby Jesse Kuehn 1B » Tue Mar 12, 2019 6:05 pm

Its all about matching the coefficients of the reactants and how many moles of reactant are reactions say for the reaction 2A>3B and delta h is -20, if there were 4 moles of A reacting then we have to multiply delta h by two so that the coefficient matches the number of moles reacting

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Re: delta H of reaction

Postby lukezhang2C » Sun Mar 17, 2019 3:22 pm

Enthalpy is a property which varies with the moles of reactants/products present, and oftentimes the units would be KJ/mole or would ask you to find it permole, so it makes sense to make stoichiometrically correct calculations when finding the enthalpy of the reaction.

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