Calculate the entropy increment of hydrogen of mass m as it passes from volume V₁ and temperature T₁ to volume V₂ and temperature T₂ if the gas: a) heats up at a constant volume V₁ and then expands isothermically; b) expands at a constant temperature T₁ to volume V₂, then heats up at a constant volume; c) adiabatically expands to V₂ volume and then heats up at a constant volume.
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