Question

$4.5$ moles each of hydrogen and iodine are heated in a sealed $10$ litre vessel. At equilibrium, $3$ moles of hydrogen iodide was found.

$H_2\left(g\right)+I_2\left(g\right)\iff 2HI\left(g\right)$

The equilibrium constant for is:

• A. $2$
• B. $1$
• C. $3$
• D. $4$

Answer 1

The correct option is B $1$

$H_2\left(g\right)+I_2\left(g\right)\rightleftharpoons 2HI\left(g\right)$

$\Delta ng=n{R}_f-n{R}_b=2-(1+1)=0$

$\begin{array}{c}\text{Hence:}{K}_{eq}\text{is always constant}\\ K=1\end{array}$