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Determine the entropy change of the systems given below and their surroundings. lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll

Discuss if the 2nd law is violated or not.

(a) A gas in a rigid tank is heated in a reversible process.

(b) An ideal gas with constant specific heats in a piston-cylinder device is cooled down in a reversible isobaric process.

(c) A gas in a piston-cylinder device is compressed in a reversible adiabatic process.

(d) A saturated liquid-vapor mixture in a piston-cylinder device releases heat in an irreversible isothermal process till the working fluid is a saturated liquid.

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