What is the mass of Chlorine gas at STP in a 100.0 liter container

Also how many moles are from that problem?

PV = nRT
n = PV / RT = (1.000 atm) x (100.0 L) / ((0.08205746 L atm/ K mol) x (273.15 K)) = 4.461 mol Cl2

(4.461 mol Cl2) x (70.9064 g Cl2/mol) = 316.3 g Cl2