First slide

Numericals involving Kc, and Kp

Question

A 10 litre closed vessel contains 5 moles of nitrogen, 10 moles of hydrogen and 10 moles of ammonia at equilibrium. Equilibrium constant for the reaction $N_{2} + 3 H_{2} ⇌ 2 {NH}_{3} is$

Moderate

A

$2 M^{- 1}$
B

$20 M^{- 2}$
C

$20 M^{2}$
D

$2 M^{- 2}$

Solution

$K_{C} = \frac{{[{NH}_{3}]}^{2}}{[N_{2}] {[H_{2}]}^{3}}; K_{C} = \frac{{(\frac{10}{10})}^{2}}{(\frac{5}{10}) {(\frac{10}{10})}^{3}}; K_{C} = \frac{10 \times 10 \times 10 \times 10}{5 \times 10 \times 10 \times 10} = 2 M^{- 2}$

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