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EBA.4(b) Calculate the change in the entropies of the system and the surroundings, and the total change in entropy, when the volume of a sample of argon gas of mass

2.9g at 298 K increases from 1.20 dm' to 4.60 dm' in (i)an isothermal reversible expansion, (ii) an isothermal irreversible expansion against p, =0. and (iii) an adiabatic reversible expansion.

Fig: 1