HARDMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryChemical EquilibriumAchiever Section

Variation of log K with 1 T is shown by the following graph. Hº for the reaction will be :

A.–19.14 J mol–1✓ Correct

B.+19.14 J mol–1

C.+4.606 cal mol–1

D.–2 cal mol–1

Explanation

According to Van’t Hoff’s equation, ΔH logK = +A 2.303RT Hence, slope = ΔH 2.303R o ΔH tan 45 1 2.303R H=( R) 2.303 19.11KJ / mol >> x

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