Q. For a reaction, $2SO_{2(g)} +O_{2(g)} \rightleftharpoons 2SO_{3(g)}$, $1.5$ moles of $SO_2$ and $1$ mole of $O_2$ are taken in a $2\,L$ vessel. At equilibrium the concentration of $SO_3$ was found to be $0.35\,mol\, L^{-1}$. The $K_c$ for the reaction would be
Equilibrium
Solution: