A set of two gas bulbs, with volumes of 500 mL and 300 mL, are connected by a closed stopcock. The 500 mL bulb contains 450 torr of Ne gas, and the 300 mL bulb contains 150 torr of Cl2 gas. When the stopcock is opened and the system comes to equilibrium, what is the total pressure in the system?
A) 338 torr
B) 540 torr
C) 263 torr
D) 600 torr
E) 300 torr