A sample of SO2Cl2 is introduced into a movable piston with the pressure maintained at 1.00 atm and — Equilibrium Chemistry Question

A sample of SO₂Cl₂ is introduced into a movable piston with the pressure maintained at 1.00 atm and the temperature at 450 K. The volume increases as the sulfuryl chloride equilibrates according to the following endothermic reaction:
SO₂Cl₂(g) ⇌ SO₂(g) + Cl₂(g) ∆H° > 0
Which changes would decrease the number of moles of SO₂Cl₂(g) present in the piston at equilibrium? In each case, the pressure is maintained at 1.00 atm.
I. The temperature of the system is increased to 500 K.
II. A sample of Ar(g) is injected into the piston.