Question

The reaction $A\left(g\right)+B\left(g\right)\rightleftharpoons 2C\left(g\right)$ is occur by mixing of 3 moles of A and 1 mole of B in one litre Container. If $\alpha$ of B is $\frac{1}{3}$, then $K_C$ for this reaction is :-

• A. 0.12
• B. 0.25
• C. 0.5
• D. 0.75

Answer 1

The correct option is B 0.25

$A\left(g\right)+B\left(g\right)\rightleftharpoons 2C\left(g\right)$
$t=0$ 3M 1M 0
$t=\alpha$ $3-\frac{1}{3}$ $1-\frac{1}{3}$ $\frac{2}{3}$

$K_C=\frac{(2/3{)}^2}{\left(8/3\right)\left(2/3\right)}=\frac{1}{4}=0.25$