Decomposition of sulfuryl chloride (SO2Cl2) is a first-order process problem. Please help! 🙂

A) By what factor will the pressure of sulfuryl chloride decrease after 5 half lives? Note: The answer wants this value: (340. torr)/value = final pressure afterdecay

The rate constant for the decomposition at 660 K is 4.5 10-2 s-1.