Question

$2S{O}_3\left(g\right)\leftrightharpoons 2S{O}_2\left(g\right)+O_2\left(g\right)$
The conventional equilibrium constant expression ($Kc$) for the system as described by the above equation is:

• A. $\frac{[S{O}_2{]}^2}{\left[S{O}_3\right]}$
  
• B. $\frac{\left[S{O}_2{]}^2\right[O_2]}{[S{O}_3{]}^2}$
• C. $\frac{\left[S{O}_2\right]}{\left[S{O}_3\right]}$
• D. $\frac{\left[S{O}_2{]}^2\right[O_2]}{\left[S{O}_3\right]}$

Answer 1

The correct option is B $\frac{\left[S{O}_2{]}^2\right[O_2]}{[S{O}_3{]}^2}$

This is an example of homogenous equilibrium.
so, $Kc$ is written as:
$Kc=\frac{\left[S{O}_2{]}^2\right[O_2]}{[S{O}_3{]}^2}$.