N2(g) + 3H2(g) + 2NH3 (9)
What will happen if pressure is increased?

equilibrium will shift to the right, and more NH3 will be formed

Explanation:

N2(g) + 3H2(g) --->  2NH3(g)

1 mol +3 mol             2 mol

       4 mol                2 mol

When we increase the pressure, the pressure will try to restore old value, so it has to become lower. Pressure is lower when number of particles is less

4 <2, so equilibrium will shift to the right, and more NH3 will be formed.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.