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The changes in gibbs energy (Delta G) of...

The changes in gibbs energy `(Delta G)` of a system for a process at constant temperature and pressure is

A

`Delta G = Delta H // TS`

B

`Delta G = T Delta S // Delta H`

C

`Delta G = Delta H - T Delta S`

D

`Delta G = Delta S - T Delta H`

Text Solution

Verified by Experts

The correct Answer is:
C
`Delta H` is the enthalpy change of a reaction, `T Delta S` is the energy change associated with nonuseful work, and `Delta G` is the energy change associated with useful work, `Delta G` is a measure of the free energy. The word "free" here does not mean without cost. "Free" energy in this context is simply the energy available to do useful work.
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