How can you increase the concentration of the product (s) in each of these reactions by varying the temperature and pressure (caused by volume change)?

4NH3 + 5O2 <=> 4NO + H2O
Delta H = -903.75 kJ

Br2 + Cl <=> 2BrCl
Delta H = 14.64 kJ

Please help...

With gaseous reactions, increased pressure causes the reaction to shift to the side that occupies the smaller volume. With increased temperature, the reaction shifts to use the heat that has been added. For the heat part of the problem, it often helps to write exothermic reactions this way.
4NH3 + 5O2 ==> 4NO + H2O + heat

and endothermic reactions this way.
Br2 + Cl + heat <==>2BrCl

With this in mind post your thoughts and we shall be happy to critique the work. Tell us why you have made the decision you made.