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Word Count: 278
concreteGases Properties of gases Elemental He or molecular co2 No shape-expands to fill any container Highly compressible density function of applied pressure Form homogeneous mixtures Individual molecules far apart from each other Pressure forcearea Gases exert pressure on any surface that it comes into contact with Units of pressure Nm-2 Pascals Other units Standard atmospheric pressure typically supports 760mm Hg at sea level 1 atmosphere atm 760mm Hg torr 1015 105 Pa pascals 1013 kPa Gas Laws Boyles Law V 1P V constant 1P PV constant fixed quantity of gases constant temp PPressure VVolume Charles Law V T quantityn P constant VT constant T absolute temperature in K TK t 273 In practice gases liquefy or solidify before 0 K KKelvin Avogadros Law Equal volumes of gases at the same TP contain equal numbers of molecules Vn count molecules by measuring Volume at specified TP STP Standard conditions 1 atm or 1013 kPa and Oc 273 K 1 mole of gas occupies 224 at STP Ideal Gas Equation Boyles V 1P n T const Charles V T n P const Avogadros V n P T const V nTP PV nRT Applies when low P high T ie when no attractive force between molecules R Universal gas Constant 83143 JK-1 mol 1 P in kPa V in L P in Pa V in m3 00821 L atm K-1 mol-1 P atm V in L units very important
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