How is internal energy change different from the heat of reaction?

G1SG2

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when the process is not adiabatic.

The process can be adiabatic or not adiabatic-I don't think that matters because we can either have E=w or E=q+w (either way, we won't have E=q). It depends on the work. If there's constant volume, no PV work is done, and so E=q. So, internal energy is different from the heat of the reaction when PV WORK IS DONE, because then E=q + w.
 

RogueUnicorn

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The process can be adiabatic or not adiabatic-I don't think that matters because we can either have E=w or E=q+w (either way, we won't have E=q). It depends on the work. If there's constant volume, no PV work is done, and so E=q. So, internal energy is different from the heat of the reaction when PV WORK IS DONE, because then E=q + w.

no. work done in an adiabatic process will decrease the temperature and thus the internal energy of a gas. the energy doesn't spontaneously arise.
 
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