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Question

The standard Gibbs energy channge at 300 K for the reaction, 2AB+C is 2494. 2J. At a given time, the composition of the reaction mixture is [A]=12,[B]=2 and [C]=12. The reaction proceeds in the (R = 8.314JK / mol, 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
Given, Go=2494.2 J
Q=[B][C][A]2=2×12(12)=4

We know, G=Go + RT ln Q
= 2494.2 + 8.314 × 300 ln 4
= 28747.27 J (+ ve value)
Also, we have G=RT ln QK
If G is positive, Q > K
Therefore, reaction shifts in reverse direction. ​​​

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