Chemistry: Le Chatelier's Principle question?

N2(g) + 3H2(g) <--> 2NH3(g) + energy

Which of the following changes to the equilibrium situation shown above will bring about an increase in the number of moles of NH3 present at equilibrium?

I. Adding N2 gas to the reaction chamber

II. Increasing the volume of the reaction chamber at constant temperature

III. Increasing the temperature of the reaction chamber at constant volume

C(s) + CO2(g) + energy <--> CO(g)

The system above is currently at equilibrium in a closed container. Which of the following changes to the system would serve to increase the number of moles of CO present at equilibrium?

I. Raising the temperature

II. Increasing the volume of the container

III. Adding more C(s) to the container