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(a) One mole of an ideal gas expands iso...

(a) One mole of an ideal gas expands isothermally and reversibly at `25^(@)C` from a volume of `10` litres to a volume of `20` litres.
(i) What is the change in entropy of the gas?
(ii) How much work is done by the gas?
(iii) What is `q` (surroundings) ?
(iv) What is the change in the entropy of the surroundings?
(v) What is the change in the entropy of the system plus the surroundings ?
(b) Also answer the questions opening a stopcock and allowing the gas to rush into an avacuated bulb of `10 L` volume.

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