The standard Gibbs energy change at 300 K for the reaction, 2A⇌B+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, ΔG∘=2494.2JQ=[B][C][A]2=2×12(12)2=4∴We know,ΔG=ΔG∘+RTInQ=2494.2+8.314×300 ln4=28747.27J(+ve value) Also, we have ΔG=RTlnQK If ΔG is positive, Q>Kc Therefore, reaction shifts in reverse direction.