LR 11 10 2014 1 A sample of Freon 12 CF2Cl2 occupies a volume of 25 5 L at 298 K and 1 23 atm What is the volume of Freon 12 at STP P1V1 P2V2 T1 T2 P1V1T2 P2V2T1 V2 P1V1T2 25 5L 1 23atm 273K P2T1 1 00atm 298K 2 28 7 L 3 50 moles of gas at 2 70 atm occupies a volume of 3 76 L What is the temperature of the gas in degrees C PV nRT T PV 2 70atm 3 76L 35 3L 273 238 C nR 3 50mol 0 0821L atm K mol 3 What is the density of Freon 11 CFCl3 at 120 C and 1 50 atm How would the density change if the pressure were lowered d PM 1 50atm 137 5g mol RT 0 0821L atm K mol 393K 4 6 39 g L If the pressure of a gas sample is quadrupled and the absolute temperature doubled how would the volume change V2 P1V1T2 1 1 2 P2T1 5 4 1 1 The new volume will be one half of 2 the initial volume What is the molar mass of a gas if 0 400g occupies 0 280L at STP M g R T 0 400g 0 0821L atm K mol 273K PV 1 00atm 0 280L 32 0 g mol 6 A gas has a density of 0 991g L at 75 C and 0 350 atm What is the molar mass of the gas M d R T 0 99s1g L 0 0821L atm K mol 348K 80 9 g mol P 0 350 atm 7 A 0 300 gram sample of a liquid was vaporized at 150 C The volume of the vapor was 0 180L under a pressure of 0 998 atm What is the molar mass of the gas M g R T 0 300g 0 0821L atm K mol 423K 58 0 g mol 1 PV 8 0 998atm 0 180L What volume will 3 00g of CO2 occupy at 100 C and 0 350atm V gRT 3 00g 0 0821L atm K mol 373K 5 97 L MP 44 0g mol 0 350atm 9 What properties of real gases cause deviation from ideal behavior Real gases have finite volume and attractive and repulsive forces between molecules 10 A 2 50 L flask at 15 0 C contains a mixture of three gases N2 He and Ne at partial pressures of 0 320 atm for N2 0 150 atm for He and 0 420 atm for Ne a Calculate the total pressure in the container 0 320 atm 0 150 atm 0 420 atm 0 890 atm b How many moles of gas are in the container ntotal PV RT 0 890 atm 2 50L 0 0821L atm K mol 288K 0 0941 mol 2
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