CHEM 121 Lecture Notes - Lecture 12: Chlorofluorocarbon, Montreal Protocol, Van Der Waals Equation
19 Jun 2015
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Chem121 - lecture 12 - real gases and chemistry in the atmosphere. Effusion: passage of a gas through a tiny orifice into an evacuated chamber. Diffusion: the migration of (gas) molecules as a result of random molecular motion. Results in the mixing of two or more gases. Graham"s law: the rate of effusion and diffusion of two different gases are inversely proportional to the square root of their molar masses (determined experimentally) (rate of effusion gas 1)/(rate of effusion gas 2) = m 2/ m 1. Note that gases must be at same pressure and temperature. Expect that rate of effusion of a gas will depend directly on the average velocities of the particles. (rate of effusion gas 1)/(rate of effusion gas 2) = (uavg gas 1)/(uavg gas 2) = 8r t / m 1/ 8rt / m 2 = m 2/ m 1. Diffusion: rate of diffusion is rate of mixing of gases.
