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Oxygen gas we...

Question

Oxygen gas weighing $64 g$ is expanded from $1$ atm to $0.25$ atm at $30^{o} C$ . Calculate entropy change, assuming the gas to be ideal.

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Solution

$n = \frac{w}{m . w t .} = \frac{64}{32} = 2$
$Δ S = 2.303 n R log (\frac{P_{2}}{P_{1}})$
$= 2.303 \times 2 \times 8.314 log (\frac{1}{0.25}) = 23.053 J K^{- 1}$

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