This problem can be solved by using ideal gas equation PV=nRT. The unit used in the numbers is already matched so you don't need to convert any of them. The calculation would be:
PV= nRT
P* 0.602 L = 0.00801 mol *311 K* (8.314 L*kPa/mol*K)
P= 20.71 L-kPa / 0.602L
P= 34.40 kPa
