Discussion
Assertion (A): Gibbs energy is the potential of choice for most chemical engineering problems.
Reason (R): Temperature and pressure are the variables usually fixed and measured in practice.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. Each thermodynamic potential is natural to a particular pair of variables, and the Gibbs energy is natural to temperature and pressure - which are precisely what a plant controls and measures. The Helmholtz energy would be preferred if volume rather than pressure were fixed, and internal energy if entropy and volume were, but neither situation is common in practice.
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