Question

1 mole of an ideal gas at ${25}^{\circ }C$ is subjected to expand reversibly and adiabatically to ten times its initial volume.

Calculate the change in entropy during expansion (in$J{k}^{-1}mo{l}^{-1}$).

• A. $19.15$
• B. $-19.15$
• C. $4.7$
• D. $0$

Answer 1

The correct option is D $0$

For adiabatic processes, $dQ=0$ and therefore $dS=0$.

$dS=\frac{dQ}{T}$

$dS=\frac{0}{298}=0$

Hence, the correct option is $D$