Question

For the reaction $2S{O}_2+O_2\rightleftharpoons 2S{O}_3$, the units of $K_c$ is:

• A. $litre/mole$
• B. $mole/litre$
• C. $(mollitr{e}^{-1}{)}^2$
• D. $(litermol{e}^{-1}{)}^2$

Answer 1

Answer: (A)

$litre/mole$

$K_C=\frac{[S{O}_3{]}^2}{\left[S{O}_2{]}^2\right[O_2]}=\frac{[{\text{mole Litre}}^{-1}{]}^2}{\left[{\text{mole Litre}}^{-1}{]}^2\right[{\text{mole Litre}}^{-1}]}$

$=\frac{1}{{\text{mole Litre}}^{-1}}={\text{Litre mole}}^{-1}$

$=Litre/mole$ .