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JEE Main Chemistry question

ChemistryThermodynamicsJEE Main

The entropy values (in ) of , and at 298 K and 1 atm pressure, the entropy change for the reaction is

Answer: (B)

Solution

\Delta S^\circ = 2S^\circ(HCl)-[S^\circ(H_2)+S^\circ(Cl_2)] = 2(186.7)-(130.6+223.0) = 373.4-353.6 = 19.8\ JK^{-1}mol^{-1}.

Question ID VK-134984