The thermally insulated cylinder is divided into two equal parts by a fixed heat-proof piston. Each part of the vessel contains one mole of helium, and the temperature in one of the parts is twice as high as in the other. The piston is released, and after equilibrium is established, the volume of one of the parts of the vessel turns out to be n = 1.5 times greater than the volume of the other part. Determine the total change in the entropy of helium.
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