What volume would be required for 157g chlorine gas at 806torr and 27 C?

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1 mole of any gas at STP is 22.4 L.  Standard temperature is 273 Kelvin (0 deg Celsius) and standard pressure is 760 mm Hg or 760 Torr.  157 g Cl2 / (70 g /mole) is 2.24 moles.  Higher pressure reduces the volume while higher temperature increases the volume.  27 C is 300 K. (2.24 moles)(22.4 L/mole)(760 Torr / 806 Torr)(300 K / 273 K) = 51.9 L or approximately 52 L