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Unformatted text preview: 3 Thermodynamics 3.1 Perfect gas Intermolecular forces between gas particles is dependent upon distance strong for small intermolecular spacing weak for large intermolecular spacing Intermolecular forces determine motion of particles => thermodynamic properties In gases at STP, intermolecular spacing is on the order of 10 molecular diameters therefore, intermolecular forces are weak Perfect gas : gas in which intermolecular forces can be neglected Perfect gas law: p RT = where R is the specific gas constant defined by R M = where ( 29 8314 J kg mol K = is the universal gas constant and M is the molecular weight Internal energy (per unit mass): e definition: total particle energy of microscopic motion: translational, rotational, vibrational, electron motion (potential), etc. equilibrium : particles of gas are in motion of maximum disorder any state variable is uniquely determined by two other state variables For a real gas (intermolecular forces are non-negligible and the possibility of chemical reaction)...
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- Fall '09