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Discussion

The van't Hoff equation describes how the equilibrium constant varies with

  • A.the particular catalyst used in the reaction
  • B.temperature, through the standard reaction enthalpy
  • C.pressure, through the volume change of the reaction
  • D.composition, through the liquid activity coefficients

Answer: B

A plot of the logarithm of the constant against reciprocal temperature has a slope of minus the standard enthalpy over the gas constant. An exothermic reaction therefore shows a constant that falls as temperature rises.

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