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JEE Main202120 Jul 2021Evening ShiftChemistryThermodynamics (C)Actual

For a given chemical reaction A → B at 300 K the free energy change is - 49 . 4 kJ mol - 1 and the enthalpy of reaction is 51 . 4 kJ mol - 1 . The entropy change of the reaction is _________ JK - 1 mol - 1 .

Correct answer

0

Step-by-step solution

Given chemical reaction: A ⟶ T = 300   K B [ ΔG ] P , T = - 49 . 4   kJ / mol ΔH rxn = 51 . 4   kJ / mol ΔS rxn = ? ⇒ From the relation [ ΔG ] P , T = ΔH - TΔS ⇒ ΔS rxn = ΔH rxn - [ ΔG ] P , T T = [ 51 . 4 - ( - 49 . 4 ) ] × 1000 300 J molK ⇒ ΔS rxn = 336 J molK

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