How many grams of Cl2 are in the sample? Chlorine is widely used to purify municipal water supplies and to treat swimming pool water. Express the mass in grams to three significant figures. Suppose that the volume of a particular sample of Cl2 gas is 8.70L at 890 torr and 24C. What volume will the Cl2 occupy at STP? Express the volume in liters to three significant figures. V ? Part C At what temperature will the volume be 14.90L if the pressure is 874 torr? Express the temperature in kelvins to three significant figures. At what pressure will the volume equal 5.50L if the temperature is 54C ? Express the pressure in atmospheres to three significant figures