Chemical Engineering Thermodynamics

During Joule-Thomson expansion of gases

  • A. Enthalpy remains constant
  • B. Entropy remains constant
  • C. Temperature remains constant
  • D. None of these
Answer: Option A.
Explanation: 

During, joule-thomson effect basically the change in internal (inter-molecular) energy and change in pressure energy will be equal to zero hence, enthalpy will remain constant.
dU+d(PV)=0
⇒d(U+PV)=0
⇒d(H)=0
or H=constant.

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