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I have currently worked through problems 8.57, 8.59, 8.61, and 8.63 (part a), and they all seem like they are asking for the same thing- the standard reaction enthalpy. However, I don't understand then why the answer in 8.57 and 8.59 is in kJ per mole and the answer for 8.61 and 8.63 (just looking at part a) is in kJ. Could someone please explain?
You use KJ per mole when you're finding the standard enthalpy of formation because it is the formation of 1 mol of a compound from its constituent elements. However, if you're just finding the enthalpy of a reaction you just use KJ. Also, my TA said that bond enthalpies can be written in KJ or KJ per mole.
In problem 8.57, they asked for the reaction enthalpy for that particular reaction. If the given enthalpy of combustion values are in kJ/mol already, do we assume that the reaction enthalpy in the answer also be kJ/mol? Cause usually reaction enthalpy is in kJ and that's what I would've put if the given values didn't have the kJ/mol units so I was confused as well...
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