STP (standard temperature and pressure) is used as a reference point for the molar volume of an ideal gas. In the USA, most chemists, most general chemistry texts, and OWL use STP= 0°C, 1 atm, where the molar volume = 22.4 L/mol. If the reference pressure is chosen to be 1 bar, the molar volume is 22.7 L/mol. Do not confuse the two. %3D L at STP. A 1.70 mol sample of argon gas occupies a volume of

0.52 mol of argon gas is admitted to an evacuated 3.00 liter (3.00 × 10-3 m3) container at 20.0°C. What is the pressure of the gas, in atm? 1.00 atm = 1.00×105 Pa. Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

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You find an old, 3-L pressurized bottle of Freon 12 (dichlorodifluoromethane, CCl2F2, MW= 120.91 g/mol) at a dump site with a gauge indicating 2.7 atm of pressure. The temperature is 10° C. How much Freon 12 is still remains in the bottle? The following data are available: Tm = -158.0° C, Tb =-29.8° C). %3D %3D T C) P° (atm) CI -29.8 1 -12.2 16.1 42.4 74.0 5 10 20 CI F