Equilibrium Ques 15

15. Hydrolysis of sucrose is given by the following reaction.

Sucrose $+H_2 O \rightleftharpoons$ Glucose + Fructose

If the equilibrium constant $(K_C)$ is $2 \times 10^{13}$ at $300$ $ K$, the value of $\Delta_r G^{\ominus}$ at the same temperature will be :

[2020]

(a) $8.314 $ $J $ $mol^{-1} $ $K^{-1} \times 300 $ $K$ $ \times \ln (2 \times 10^{13})$

(b) $8.314 $ $J $ $mol^{-1}$ $ K^{-1} \times 300 $ $K$ $ \times \ln (3 \times 10^{13})$

(c) $-8.314 $ $J $ $mol^{-1}$ $ K^{-1} \times 300 $ $K$ $ \times \ln (4 \times 10^{13})$

(d) $-8.314 $ $J $ $mol^{-1}$ $ K^{-1} \times 300 $ $K$ $ \times \ln (2 \times 10^{13})$

Show Answer

Answer:

Correct Answer: 15.(d)

Solution:

  1. (d) $\Delta G=\Delta G^{\circ}+R T \ln Q$

At equilibrium $\Delta G=0, Q=K _{e q}$

So, $\Delta_r G^{\circ}=-R T \ln K _{e q}$

$\Delta_r G^{\circ}=-8.314$ $ J $ $mol^{-1}$ $ K^{-1} \times 300 $ $K$ $ \times \ln (2 \times 10^{13})$



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