Question

If the total pressure of the system is increased when the reaction represented above is at equilibrium, which of the following occurs?

• A. The concentration of $H_2$ increases
• B. The concentration of $N_2$ increases
• C. The reaction will shift to the right
• D. The reaction will shift to the left
• E. The $H_2$ gas condenses

Answer 1

The correct option is C The reaction will shift to the right

Option C is the correct answer. Pressure is directly proportional to the number of moles. There are 2 moles in the forward direction and 4 moles in the backward direction. On increasing the pressure, the number of moles increases. According to Le, Chatelier's principle, the reaction will go to that direction where the number of moles decreases. Hence, the reaction will go in the forward direction or right, where the number of moles is less.