The mathematical expression for the change in free energy of a system is ?G =?H - T?S. Which of the following is (are) correct?

The mathematical expression for the change in free energy of a system is ?G =?H - T?S. Which of the following is (are) correct? 






A) ?S is the change in enthalpy, a measure of randomness.
B) ?H is the change in entropy, the energy available to do work.
C) ?G is the change in free energy.
D) T is the temperature in degrees Celsius.







Answer: C


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