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Unformatted text preview: Chapter 10- Pressure (P) - conveys the idea of a force, a push that tends to move something in a give direction o 1 atm = 760 mm Hg 760 torr 101.3 kilopascals 1.01325 10 5 pascals (Pa) 1 bar = 10 5 pascals (Pa)- Gas- n (moles)- Temperature of gas- V (liters, L)- Pressure is the force acting on an object per unit area o P = F/A o F = Ma o a- acceleration (9.8 m/s 2) o F = force o A = area o P = 1 X 10 5 N/ 1m 2 1 X 10 5 kPa- Boyle’s Law- a fixed quantity of gas is inversely proportional to it’s volume o P 1 V 1 = P 2 V 2 o PV = constant o V = constant X 1/P- Charles’ Law- volume of a fixed amount of gas is maintained at constant pressure which is directly equal to the temperature o V = constant x T o V/T = constant o V 1 /T 1 = V 2 /T 2- Avogadro’s – volume of a gas at the same temperature and pressure contain equal number of molecules o V = constant X n- K = o C + 273.15- R = gas constant (.08206 L atm/ mol K)- PV = nRT o P = pressure o V= volume o R= gas constant o N = gas quantity o T = temperature ( Kelvin)- P 1 V 1 /n 1 T 1 = P 2 V 2 /n 2 T 2- ideal gas law- Gas densities and Molar Masses- o PV= nRT o N/V = P/RT o M/MMV = P/RT o d = M/V = PMM/RT = nMM/V o MM = dRT/P- Partial Pressure is the pressure exerted by a particular component of a gas mixture (Dalton’s Law) o Partial = mol/total mol o P t = P 1 + P 2 + P 3 ……. o P x = (n x ) RT/V o P t = (n 1 + n 2 + n 3 +……)RT/V = (n t ) RT/V\ o Mole fraction- P 1 = (n 1 /n t ) P t = X 1 P t- Gas in water – o P total = P gas + P water- Average Kinetic Energy, ε - o ε = ½ mμ...
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- Spring '06
- London Dispersion Forces, Intermolecular force, Van der Waals force