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In my discussion section last week, we discussed how to solve for reaction enthalpies using Hess's Law, bond enthalpies and standard enthalpies of formation, and we did a practice problem where we had to calculate reaction enthalpy of a reaction at 100º C instead of 25º C using the standard enthalpy of formation. I was wondering if it is possible to do the same problem using other methods of calculating enthalpy, such as Hess's law.
My TA told me that for the other methods, we should assume that the information given is at the temperature of the reaction enthalpy. For example, if you need to find the reaction enthalpy at 30ºC using Hess's law, the other reactions must also be at 30ºC. I do not believe temperature change can be calculate for without using standard enthalpy of formation.
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