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Unformatted text preview: • At intermediate separation the potential is negative. • At large separation the potential is zero. The compression factor 12 Virial coefficients 13 RT pV p RT V V V Z m m o m m = = = / • There is small difference between real and perfect behaviour at high T, low p • Model using virial equation of state • pV m / RT= (1 + B’p + C’p 2 + …) • More convenient expression • pV m / RT= (1 + B/V m + C/V m 2 + …) • In each case Z = expression in parentheses Critical constants 14 The van der Waals equation 15 2 m m V a b V RT p= V m = V / n 15 Solving the van der Waals equation 16...
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 Spring '08
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 Physical chemistry, Mole, Partial Pressure, pH, Van der Waals, 8 Mole, Vm Vm pVm

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