Statistical Thermodynamics provides the link between the microscopic properties of matter and its bulk (macroscopic) properties.It answers one of the most important question in Chemistry: how are the molecules distributed over the energy states at a given temperature?Two major concepts: The Boltzmann Factor and the Partition Function
The system is defined as an ensembleor macroscopic systems in thermal equilibrium with a heat reservoir. The number of the system in a state j with an energy associated Ej(N,V) is ajand the total number of the systems is A.E1E2E3E1E2E3E1E2E3E1E2E3
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The simplest case we consider is a monoatomic gas with only translational energy.For this system, we can define the total energy, Ej(N,V), simply by adding the energy of each individual molecular energies:NjVNEεεεε++++=....),(321Where N is the total number of molecules and εjthe individual energies of themolecules