A 0.200 mole sample of Cl2 (g) at 27 C exerts 0.500 atm of pressure. If the temperature of the system is increased to 127 C, and the volume remains the same, what pressure does the gas exert?
1) 0.667 atm
2) 0.333 atm
3) 2.35 atm
4) 1.20 atm
5) 4.30 atm