Question

If $\Delta G^o$ for the reaction given below is $1.7kJ$; the equilibrium constant of the reaction,

$2HI\left(g\right)\rightleftharpoons H_2\left(g\right)+I_2\left(g\right)$ at ${25}^{\circ }C$, is:

• A. $0.5$
• B. $2.0$
• C. $3.9$
• D. $24.0$

Answer 1

The correct option is A $0.5$

$\Delta G^{\circ }=-RTlnK$

$1700=-2.303\times 8.314\times 298\times logK$

$logK=\frac{-1700}{2.303\times 8.314\times 298}$

$logK=-0.3$

$⟹K=0.5$

Hence, option A is correct.