Question

What will be the entropy change when two moles of an ideal gas expands reversibly from initial volume of 1 litre to 10 litre at constant temperature 300 K?

• A. $5.74kJ{K}^{-1}mo{l}^{-1}$
• B. $19.15J{K}^{-1}mo{l}^{-1}$
• C. $38.29J{K}^{-1}mo{l}^{-1}$
• D. $11.48kJ{K}^{-1}mo{l}^{-1}$

Answer 1

The correct option is C $38.29J{K}^{-1}mo{l}^{-1}$

Entropy change in isothermal process.
$\Delta S=2.303nR\log \frac{V_2}{V_1}$

$=2.303\times 2\times 8.314\log \frac{10}{1}$

$=38.29J{K}^{–1}mo{l}^{–1}$