A gas tank holds 15.0 liters of gas at 37C and 342 kPa. What volume would this gas occupy at STP?
(P1V1/T1) = (P2V2/T2)
You know standard pressure in kPa is 101.325. Or you may use atomospheres and use 1 atm for P2 (standard) and convert 342 kPa to atm.