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State whether the following is true or false.
A plot of the logarithm of vapour pressure against reciprocal absolute temperature is nearly a straight line.

  • A.True
  • B.False
  • C.True only at large scales
  • D.False only at small scales

Answer: A

That linearity is the direct consequence of the Clausius-Clapeyron equation with constant latent heat, and its slope gives the enthalpy of vaporisation. Slight curvature reflects the temperature dependence of the latent heat.

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