Question

One mole of nitrogen is mixed with 3 moles of hydrogen in 4-litre container. If 0.50 % of nitrogen is converted to ammonia by the following reaction,

N₂(g) + 3H₂(g) ⇋ 2NH₃(g),

Calculate the equilibrium constant (K_c) in concentration units. What will be the value of K_c for the following equilibrium? 

1/2N₂(g) + 3/2H₂(g) ⇋ 2NH₃(g),

Answer 1

Using the reaction, calculate equilibrium concentration and K_c . Apply the formula for the next reaction and solve the new K_c.

We can see that the above reaction has been obtained by multiplying the equation

N₂(g) + 3H₂(g) ⇋ 2NH₃(g), by 1/2.

Thus, the new equilibrium constant = (6.0 × 10^–5)^1/2 K_c = 7.7 x 10^-3(mole/litre)^–1