Question

For the process, $H_{2}O\left(l\right)⟶H_{2}O\left(g\right)$ at $t={100}^{o}C$ and $1$ atmosphere pressure, the correct choice is:

• A. $\Delta S_{system}>0,\Delta S_{suroundings}>0$
• B. $\Delta S_{system}>0,\Delta S_{suroundings}<0$
• C. $\Delta S_{system}<0,\Delta S_{suroundings}>0$
• D. $\Delta S_{system}<0,\Delta S_{suroundings}<0$

Answer 1

Answer: (B)

$\Delta S_{system}>0,\Delta S_{suroundings}<0$

$\text{no of gas molecules is greater than no of liquid molecules.}$

$\text{So entropy increases for the system and reverse are done with the surrounding.}$