Half a mole of an ideal gas expands isothermally and reversibly at 298.15 K from a volume of 10 L to a volume of 20 L. (a) What is the change in the entropy of the gas? (b) How much work is done on the gas? (c) What is qsurr? (d) What is the change in the entropy of the surroundings? (e) What is the change in the entropy of the universe? 3

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A: We know that -  Ka×Kb = 10-14

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