Question

For the reaction : $H_{2\left(g\right)}+I_{2\left(g\right)}\rightleftharpoons 2H{I}_{\left(g\right)}$, the standard free energy is $△G^0>0$.
The equilibrium constant (K) would be _______.

• A. K = $0$
• B. K > $1$
• C. K = $1$
• D. K < $1$

Answer 1

The correct option is D K < $1$

The given reaction is :-

$H_2\left(g\right)+I_2\left(g\right)\rightleftharpoons 2HI\left(g\right);△G^0=0$

By, themodynamical view of equilibrium,

$△G^0=-RTlnK>0$

$\downarrow$ $\downarrow$ $\searrow$

standard gas equilibrium constant

fibb's const.

free energy

$\Rightarrow -RTlnK>0$

Now, $R>0\&T>0$

$\Rightarrow -lnK>0$

$\Rightarrow K<1$