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  4. Calculate entropy change when 5 moles of an ideal gas expands reversibly and isothermally from an initial volume of 5 litre to 50 litre at 27° C

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Q. Calculate entropy change when $5$ moles of an ideal gas expands reversibly and isothermally from an initial volume of $5$ litre to $50$ litre at $27^{\circ} C$

Thermodynamics

Solution:

$\Delta S =2.303\, n R \log \frac{V_{2}}{V_{1}}$

$= 2.303 \times 5 \times 8.314 \log \frac{50}{5}=95.74 \,JK ^{-1}$