Thermodynamics

Thermodynamics

Question

The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27°C is

  • 38.3 J mol-1 K-1

  • 35.8 J  mol-1 K-1

  • 32.3 J  mol-1 K-1

  • 42.3 J mol-1 K-1

Answer

A.

38.3 J mol-1 K-1

increment straight S space equals space nR space In space straight V subscript 2 over straight V subscript 1
equals space 2.303 space nR space log space straight V subscript 2 over straight V subscript 1
space equals space 2.303 space straight x space 2 space straight x space 8.314 space straight x space log space 100 over 10
equals space 38.3 space straight J space mol to the power of negative 1 end exponent straight k to the power of negative 1 end exponent

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