I need help understanding how to do this, could anyone help?

Question

Consider the reaction shown below to answer the following questions.

A (g) ↔ 2B (g) ΔH = + K > 1  

Explain how the reaction would respond if each of the following changes were made after equilibrium 

were established.

(a) The temperature is decreased.

(b) The pressure is increased.

(c) An additional 0.25 moles of A are pumped into the reaction chamber.

Answer 1

Review Le Chatelier's Principle

A(g) <==> 2B ... ∆H = + and K>1

a) Since ∆H is +, heat is being added as a reactant so decreasing the temperature will push rx to right

b) Since there are 2 moles of gas on product side and 1 on reactant side, increasing pressure will push rx to left

c) Adding A will push rx to the right by law of mass action