For the reaction $a+b \rightleftharpoons c+d$, initially concentrations of $a$ and $b$ are equal and

Question

For the reaction $a+b \rightleftharpoons c+d$, initially concentrations of $a$ and $b$ are equal and at equilibrium the concentration of $d$ will be twice of that of $a$. What will be the equilibrium constant for the reaction?

Professor PC Thomas Classes · Answer

$K_c=\frac{2 x \cdot 2 x}{x \cdot x}=\frac{4 x^2}{x^2} \Rightarrow K_c=4$