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The Antoine equation differs from Clausius-Clapeyron in that it

  • A.requires the critical properties of the fluid as inputs
  • B.adds an empirical constant in the denominator
  • C.is derived from first principles without any approximation
  • D.applies only above the critical temperature of the fluid

Answer: B

The extra constant is a purely empirical correction that greatly improves the fit over a moderate range. Its parameters are tabulated and are valid only over the range for which they were regressed. Extrapolating beyond that range can be badly wrong.

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