CH 222 Week 5 Friday 2-8

# The effect of interparticle attraction van der waals

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Unformatted text preview: rticle attractions. The effect of interparticle attraction Van der Waals equation for n moles of a real gas n 2a ( P + 2 )(V ! n b ) = n R T V The constant a relates to The constant b relates to factors that influence the particle volume. attraction between particles. Different compounds have different a and b values Vapor Pressure 5-13 A special case of a gas I a gas at equilibrium with a liquid The partial pressure of a such a gas cannot be increased or decreased as long as there are both gas and liquid present If you compress the gas, some of the gas get converted to liquid If you expand the gas, some of the liquid evaporates The pressure of a gas at equilibrium with a liquid is called the liquid’s vapor pressure The vapor pressure of a liquid is a function of temperature it is a function of the kind of liquid, and it is a function of the purity of the liquid For a pure liquid at a constant temperature, it is constant Kinetic Energy and Gas Behavior t a given T, all gases in a sample have the same Kinetic Energy and Gas Behavior verage kinetic energy. At a given T, all gases in a sample have the same average kinetic energy Ek = 1 2 mass x speed2 kinetic energy depends on the mass and the speed of a particle inetic energat the pends a heavier gas e mass and the slowly than a lighter one y de same T, on both th particle moves more peed of a particle. t the same T, a heavier gas particle moves more lowly than a lighter one. 16:27 16:27...
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