Chemistry - Chemical Equilibrium Question with Solution | TestHub

Question Explanation: Calculation of $K_C$.

Concept: This question is based on the calculation of $K_C$.

Solution:

$$2S{O}_2(g)+O_2(g)\rightleftharpoons 2S{O}_3(g)$$

At $t=t_{eq}$:

$S{O}_2$: $\frac{12.8}{64}=0.2mole$

$O_2$: $\frac{9.6}{32}=0.3mole$

$S{O}_3$: $\frac{48}{80}=0.6mole$

$$K_C=\frac{[S{O}_3{]}^2}{[S{O}_2{]}^2[O_2]}=\frac{{\left(\frac{0.6}{1}\right)}^2}{{\left(\frac{0.2}{1}\right)}^2\left(\frac{0.3}{1}\right)}=\frac{0.6\times 0.6}{0.2\times 0.2\times 0.3}=30$$

Final Answer: The correct option is (b).