Thermodynamics

Thermodynamics

Question

Which of the following lines correctly show the temperature dependence of equilibrium constant K, for an exothermic reaction?

  • A and D

  • A and B

  • B and C

  • C and D

Answer

B.

A and B

G° = - RT ln KH° - TS° = - RT ln K-H°RT+S°R = ln K

Therefore ln K vs 1/T the graph will be a straight line with slope equal to -H°R.Since reaction is
exothermic, therefore H° itself will be negative resulting in positive slope.

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