Chemical Engineering Thermodynamics

For an irreversible process involving only pressure-volume work_____.

  • A. (dF)T, p <0
  • B. (dF)T, p = 0
  • C. (dF)T, p > 0
  • D. (dA)T, v >0
Answer: Option A.
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
⇒ (dF)T,P<0. For spontaneous process. Here the F is Gibbs free energy and A is Helmholtz free energy.

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