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    Isothermal expansion of a gas - change in entropy

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    One-gram molecule of a gas expands isothermally to four times its volume. Calculate the change in entropy in terms of the gas constant.

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    Please view the attachment.

    Work done, W = integral v1 to v2 [PdV]

    (Please take v1 as the lower limit and v2 as the upper limit for the ...

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    Solution as word attachement with more than 100 words explanation.