The value o f Kc for the reaction, 2A leftharpoons B + C is 2 x 10-3 . At a given time, the composition o f reaction mixture is [A] = [B] = [C] = 3 x 10-4 M, in which direction the reaction will proceed?

Question

The value o f Kc for the reaction, 2A leftharpoons B + C is 2 x 10-3 . At a given time, the composition o f reaction mixture is [A] = [B] = [C] = 3 x 10-4 M, in which direction the reaction will proceed? (A) Forward direction (B) Backward direction (C) Both(a) and (b) (D) None of these.

Tardigrade Admin · Accepted Answer

For the reaction the reaction quotient Qc is given by, Qc= [S][C] / [A]2 as [A] = [B] = [C] = 3 × 10-4 M Qc = (3 x 10-4) (3 × 10-4 )/(3 × 10-4)2 = 1 as Qc > Kc so the reaction will proceed in the reverse direction

Q. The value o f Kc for the reaction, $2 A ⇌ B + C$ is $2 x 1 0^{- 3}$ . At a given time, the composition o f reaction mixture is $[A] = [B] = [C] = 3 x 1 0^{- 4} M,$ in which direction the reaction will proceed?

Forward direction

Backward direction

Both(a) and (b)

None of these.

For the reaction the reaction quotient $Q_{c}$ is given by,
$Q c = [S] [C] / [A]^{2}$
as $[A] = [B] = [C] = 3 \times 1 0^{- 4} M$
$Q_{c} = (3 x 1 0^{- 4}) (3 \times 1 0^{- 4}) / (3 \times 1 0^{- 4})^{2} = 1$
as $Q_{c} > K_{c}$ so the reaction will proceed in the reverse direction

Q. The value o f Kc for the reaction, 2A⇌B+C is 2x10−3. At a given time, the composition o f reaction mixture is [A]=[B]=[C]=3x10−4M, in which direction the reaction will proceed?