What the answer and the work to all these

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

How do you know when a chemical reaction has occurred