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Pressure Volume Moles Temperature Common units Atmospheres (atm) mm Hg Torr kiloPascals (kPa) Pounds per square inch (psi) Bar or millibar (b or mb)

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Presentation on theme: "Pressure Volume Moles Temperature Common units Atmospheres (atm) mm Hg Torr kiloPascals (kPa) Pounds per square inch (psi) Bar or millibar (b or mb)"— Presentation transcript:

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2 Pressure Volume Moles Temperature

3 Common units Atmospheres (atm) mm Hg Torr kiloPascals (kPa) Pounds per square inch (psi) Bar or millibar (b or mb) Influences Weight of air or water above you Force caused by gas particle collisions with the container wall

4 1 atm 760 torr 760 mmHg kPa psi

5 Typically in Liters mL = cc or cm 3

6 Gas laws are independent of mass, but are dependent on moles, which represents number of particles Exception is Grahams Law

7 Must use Kelvins K = o C , but we can get away with saying 273

8 PV/nT = PV/nT Cross out any factors that are either constant or unmentioned Use this only if a factor is changing

9 Boyles Law PV Charles Law VT Avogadros Law Vn Gay-Lussac: PT

10 PV=nRT Use when you have all factors but one and the system is not changing R = ideal gas constant Values for R: depends upon your unit of pressure L atm/mol K L mmHg/mol K L torr / mol K L kPa/mol K

11 Pressure Tot = partial pressure Mole fraction = pressure fraction

12 Pressure Tot = P coll gas + P water vapor Total Pressure = atmospheric pressure Water vapor pressure can be looked up in a table by temperature Pressure of dry gas = Atmospheric pressure – water vapor pressure

13 Have a mixture of 2 mol He, 4 mol Kr, and 4 mol Ar. If the total pressure is 760 mmHg, what is the partial pressure of Ar? Mole fraction of Ar = 4/(2+4+4) or.4 Partial pressure of Ar = 760 x.4 Partial pressure of Ar = 304 mmHg

14 Two gases in a mixture are at the same temperature Same temp means same avg kinetic energy ½ mv 2 = ½ mv 2 The lower mass will have the higher velocity A lower mass gas will diffuse or effuse faster

15 May have to use PV=nRT to find moles of known or unknown Be careful with your phase symbols. ALL gases must be considered


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