What is Gibb’s paradox? Derive Sackur-Tetrode equation of entropy for a classical, ideal gas.

Gibbs’ paradox is a notable concept in statistical mechanics that arises when trying to calculate the entropy of a system of identical particles, such as an ideal gas, and leads to apparent contradictions when considering indistinguishable particles. The paradox arises from the fact that, in classical mechanics, the particles of a gas are treated as distinguishable, which suggests that swapping two identical particles would result in a new, distinguishable microstate. This assumption violates the fact that identical particles in quantum mechanics are fundamentally indistinguishable, and such swaps should not count as creating distinct microstates.

Mathematically, the paradox is highlighted in the calculation of entropy. When calculating the entropy of a gas in classical mechanics, if the particles are treated as distinguishable, the entropy __________ ________ ______ _______ ________ _______ ____ _________ ______ _____ ____.
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