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The difference between the heat capacity at constant pressure and that at constant volume for an ideal gas is

  • A.the acentric factor times the gas constant
  • B.the gas constant
  • C.zero
  • D.the ratio of the two capacities

Answer: B

Heating at constant pressure must also supply the work of expansion, and for an ideal gas that difference comes out exactly as the gas constant. For real fluids the difference depends on expansivity and compressibility.

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