Molecular

Molecular - 18-2. Molecular Properties of Matter F(r)=...

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Liu UCD Phy9B 07 6 18-2. Molecular Properties of Matter F(r)= -dU/dr r>r o ,F < 0 ,U increases w/ increasing r r<r o > 0 increases w/ decreasing r At r o , F = 0 , U at minumum Temperature rises: Solid liquid gas Intermolecular distance Molecular kinetic energy
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Liu UCD Phy9B 07 7 18-3. Kinetic-Molecular Model of an Ideal Gas Average translational kinetic energy for N molecules N v m K av tr × = ) ( 2 1 2 V v Nm A F p av 3 ) ( 2 = = tr av K v m N pV 3 2 ] ) ( 2 1 [ 3 2 2 = = nRT K tr 2 3 = kT v m av 2 3 ) ( 2 1 2 = Average translational kinetic energy of a gas molecule
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Liu UCD Phy9B 07 8 18-4. Heat Capacity Consider a gas at constant volume nRdT dK tr 2 3 = Define molar heat capacity at const. Volume: C V Adding heat dQ into the system: dT nC dQ V = Thus nRdT dT nC V 2 3 = K J/mol 12.47 2 3 = = R C V Ideal gas of point particles Applies to monatomic gases, way off for diatomic & polyatomic gases
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Liu UCD Phy9B 07 9 Equipartition of Energy Equipartition of Energy: Each velocity component (linear or angular) is associated
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Molecular - 18-2. Molecular Properties of Matter F(r)=...

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