Question

2 and H2 are taken in 1 : 3 molar ratio in a closed vessel to attained the following equilibrium

N2(g) + 3H2(g) $\rightleftharpoons$ 2NH3(g) . Find Kp for reaction at total pressure of 2P if at equilibrium is

• A. $\frac{1}{3P^{2}}$
• B. $\frac{4}{3P^{2}}$
• C. $\frac{4P^{2}}{3}$
• D. None

Answer 1

Answer: (B)

$\frac{4}{3P^{2}}$

Answer 2

N2(g) + 3H2(g) $\rightleftharpoons$ 2NH3(g)

At equilibrium $\frac{P}{3}$ P , $\frac{P}{3}$ + P +$P_{NH_{3}}$ = 2P

$P_{NH_{3}}$= $\frac{2P}{3}$

$K_{p}\frac{\frac{2P}{3} \times \frac{2P}{3}}{\frac{P}{3} \times P^{3}} = \frac{1}{P^{2}}.\frac{4}{3} \Rightarrow K_{p} = \frac{4}{3P^{2}}$