Answer to Question #104579 in Physical Chemistry for Amit Panchal

Question

In the following equilibrium, predict the direction of shift of equilibrium for each
condition listed below. Justify giving reasons.

N2(g) + 3H2 (g) ⇄ 2NH3 (g) + 92 kJ

i) Addition of H2
ii) increased pressure
iii) lowering of temperature.

Answer 1

Solution.

According to the Le Chatelier-brown principle , the influence of external forces on a system in equilibrium results in reducing this effect.

i)

Adding hydrogen will cause the equilibrium to shift towards the reaction products (direct reaction). 

ii)

Increasing the pressure in the system will cause the chemical equilibrium to shift towards the reaction products (direct reaction).

iii)

Since the process is exothermic, a decrease in temperature will lead to a shift in the chemical equilibrium towards the reaction products (direct reaction).

Answer:

i)

direct reaction

ii)

direct reaction

iii)

direct reaction