Question

$4.5$ moles each of hydrogen and iodine heated in a sealed ten-litre vessel. At equilibrium, $3$ moles of $HI$ were found.

The equilibrium constant for $H_2\left(g\right)$ + $I_2\left(g\right)\rightleftharpoons 2HI\left(g\right)$ is:

• A. $1$
• B. $10$
• C. $5$
• D. $0.33$

Answer 1

The correct option is A $1$

Equilibrium constant $K_c$ is equal to the ratio of concentration of products to that of concentration of reactants.

Now, $K_c=\frac{[HI{]}^2}{\left[I^2\right]\times \left[H_2\right]}$

$K_c=\frac{3\times 3}{3\times 3}$

$K_c=1$