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Oxygen gas weighing 128 g is expanded fo...

Oxygen gas weighing `128 g` is expanded form `1atm` to `0.25 atm` at `30^(@)C`. Calculate entropy change, assuming the gas to be ideal.

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`n = (W)/("Molecular weight") = (128)/(32) = 4`
`DeltaS = 2.303 nR log_(10) ((P_(1))/(P_(2)))`
`= 2.303 xx 4xx 8.314 log_(10) ((1)/(0.25))`
`= 46.10 J K^(-1)`
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