Question

If $900J/g$ of heat is exchanged at boiling point of water, then what is increase in entropy?

• A. $43.4J/Kmole$
• B. $87.2J/Kmole$
• C. $900J/Kmole$
• D. $Zero$

Answer 1

The correct option is A $43.4J/Kmole$

We know that $\Delta S=\Delta H/T$

Where $\Delta S$=change in entropy,

$\Delta H$=change in enthalpy

$T$=temperature

$\because$ Boiling point of water is at ${100}^{\circ }C$

$\therefore T=273+100=373K$

$\Delta S=\frac{900\times 18}{373}$ $\frac{J}{KMole}=43.4J/Kmole$