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JEE Main Chemistry question

ChemistryThermodynamicsJEE Main

At 320 K, a gas is 20% dissociated to . The standard free energy change () at 320 K and 1 atm (the initial pressure of , in a constant-volume vessel) is approximately kJ mol⁻¹. (, , )

Answer: 4.28

Solution

; basis 1 mol at 1 atm initially in a fixed-volume vessel, so each species' partial pressure stays directly proportional to its own mole number (not renormalized by the changing total moles). With : atm,

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Question ID VK-136638