21.33 A certain hypothetical system is composed of 1 mole of identical, noninteracting, indistinguishable particles. Each particle has available to it only three energy levels, whose energies and degeneracies are e, =0, g,=1; ɛ,/k =100K , 82 = 3; e,/k= 300K, g,=5. (k is Boltzmann's constant.) (a) Calculate Z at 200 K. (b) Calculate the average number of molecules in each level at 200 K. (c) Calculate the average number of molecule in each level in the limit T ~ 00.

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.