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Question

The standard Gibbs energy change at 300 K for the reaction 2AB+C is 2494.2 J. At a given time, the composition of the reaction mixture is [A] = 12, [B] = 2 and [C] =12 . The reaction proceeds in the: (R=8.314 JK1mol1,e=2.718)

A
forward direction because Q>Kc
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B
reverse direction because Q>Kc
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C
forward direction because Q<Kc
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D
reverse direction because Q<Kc
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Solution

The correct option is B reverse direction because Q>Kc
We know that,

ΔG=ΔGo+RTlnQ
=2494.2 + 8.314 ×300ln 4
>0 (positive)

Since ΔG>0, Q>K, so the reaction shifts in the reverse direction

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