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Molecules Collection Energies
The main objective of this particular aspect of Physical Chemistry is to analyse the collections of large number of molecules, like those one deals with an ordinary sized, or macroscopic, systems, contain molecules distributed throughout the allowed states. A molecule or an atom or an electron exists in one of the allowed states and has the energy corresponding to that state. Many of the properties of chemical materials can be deduced if the energies of the quantum states and the distribution throughout these states are known. In practice, the deduction of properties of macroscopic samples from such detailed calculations is often impossibly difficult. But the calculation can be carried out for many ideal-gas systems, and the general principles of the procedure can be appreciated.
The energies of molecules can be described in terms of the energy in each degree of freedom. The motions of a molecule of a gas can be thought of in terms of motion in each “degree of freedom”. The expression for the allowed energies for the translational motion of molecule along one coordinate, one of the three translational degrees of freedom, is given. This expression applies to each of the three translational degrees of freedom of a gas molecule.
The rotation of a linear molecule can be described in terms of rotation around the two axes that can be drawn perpendicular to the internuclear axis of the molecule. A linear molecule has 2 rotational degrees of freedom. The motion of a generally shaped molecule cannot, it turns out, be described in rotational contributions for 2 degrees of freedom provide only a general guide to the allowed energies for the 3 rotational degrees of freedom of a generally shaped molecule.
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The energies of molecules can be described in terms of the energy in each degree of freedom. The motions of a molecule of a gas can be thought of in terms of motion in each “degree of freedom”. The expression for the allowed energies for the translational motion of molecule along one coordinate, one of the three translational degrees of freedom, is given. This expression applies to each of the three translational degrees of freedom of a gas molecule.
The rotation of a linear molecule can be described in terms of rotation around the two axes that can be drawn perpendicular to the internuclear axis of the molecule. A linear molecule has 2 rotational degrees of freedom. The motion of a generally shaped molecule cannot, it turns out, be described in rotational contributions for 2 degrees of freedom provide only a general guide to the allowed energies for the 3 rotational degrees of freedom of a generally shaped molecule.
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Inorganic Chemistry
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Physical Chemistry
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Covalent Radii
Crystal Shapes, Point Groups
Diffraction Pattern Assignments
Electron Diffraction
Ionic Radii
Lattice Energies
Diffraction
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Neutron Diffraction
Waals Radii
X-ray Diffraction
Bond Moments
Electric Capacitor
Atoms, Molecules Properties
Paramagnetism
Electrolytic Dissociation
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Electrochemical Cell
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Rotational Energies
Schrodinger Wave Equation
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Molecules Collection Energies
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Liquid Vapour Free Energies
Osmotic Pressure
Partial Molal Quantities
Solvent Free Energy
Vapour Pressure Lowering




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