Discussion
A hypothetical path is used in energy balance calculations because
Answer: A
Correct answer: enthalpy is a state function of the stream
Because enthalpy depends only on the end states and not on how the change occurred, any convenient path between them gives the same answer. That licenses the standard construction: bring the reactants to 25 degrees, react them there where the tabulated data apply, and heat the products to the outlet temperature - a path nothing in the real process follows.
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