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Question 31085
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Kinetic Theory and Thermodynamics: Real Gases MCQ

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Real GasesHardQuestion 31085

Question

Inversion temperature of a van der Waals gas (above which Joule-Thomson expansion causes warming) is:
  1. A
    2a/(Rb)
    Correct
  2. B
    2a/(bR)
  3. C
    a/(2Rb)
  4. D
    Rb/(2a)

Correct answer

2a/(Rb)

Explanation

T_inv = 2a/(Rb). Below T_inv, JT expansion causes cooling (throttling refrigerators exploit this). Above T_inv, gas warms on expansion.

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