Question

Given the reaction at equilibrium:
N2 (g) +3H2 (g) <==> 2NH3 (g) + energy
Which changes occur when the temperature of this system is deceased?
A) the concentration of h2 increases and the concentration of n2 increases
b) the concentration of h2 decreases and the concentration of n2 increases
C) the concentration of h2 decreases and the concentration of nh3 decreases
D) the concentration of of h2 decreases and the concentration of nh3 increases

Answer 1

Use LeChatelier's principle. Lowering the temperature (the stress on the system) can be partially offset by releasing energy in the exothermic (forward) reaction. Think about how the concentrations will change if the equilibrium shifts to the right.

Answer 2

So is that C?

Answer 3

No. Look carefully at the forward reaction and think about how concentrations change for a shift to the right.

Answer 4

Ohhh it's D