Q. For the homogenous reaction, $4NH_{3} + 5O_{2} \rightleftharpoons 4NO + 6H_{2}O$ the equilibrium constant $K_{c}$ has the units
A) $conc.^{+ 10}$
B) $conc.^{+ 1}$
C) $conc.^{- 1}$
D) It is dimensionless
Explanation
(b)
$4NH_{3} + 5O_{2} \rightleftharpoons 4NO + 6H_{2}O$
$K_{c} = \frac{\lbrack NO\rbrack^{2}\left\lbrack H_{2}O \right\rbrack^{6}}{\left\lbrack NH_{3} \right\rbrack^{4}\left\lbrack O_{2} \right\rbrack^{5}}$
Hence, units of $K_{c} = Conc^{+ 1}$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.