Chemical Engineering Thermodynamics

A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is

  • A. Zero
  • B. Positive
  • C. Negative
  • D. None of these
Answer: Option C.
Explanation: 

Since for an spontaneous process TdS>dU+PdV

For, constant temperature and constant pressure process the above equation can be written as
d(TS−U)>PdV
⇒d(−A)>PdV
⇒(dG)T,P<0

For spontaneous process.

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