Subrat posted an Question
January 15, 2022 • 06:33 am 30 points
  • IIT JAM
  • Physics (PH)

An isolated ideal gas of one mole is made to free expansion, twice of its volume. change in entropy in si unit is ?

An isolated ideal gas of one mole is made to free expansion, twice of its volume. Change in entropy in SI unit is ?

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    Kapil prajapat best-answer

    free expansion means temperature is same not adiabatic.

  • Dr suman 1

    Change in entropy = ΔS = Nk × ln(Vf/Vi) N = number of atoms (1 mole equals Avogadro’s number) = 6.022 × 10^23 k = Boltzmann constant = 1.3806 × 10^-23 Vf = final volume = 2 Vi = initial volume = 1 Then, ΔS = Nk × ln(Vf/Vi) = (6.022 × 10^23) × (1.3806× 10^-23) × ln(2/1) = 5.763

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    free expansion = adiabatic process. Am I right ??? then ∆s = 0

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