# The entropy change associated with the conversion

Question:

The entropy change associated with the conversion of $1 \mathrm{~kg}$ of ice at $273 \mathrm{~K}$ to water vapours at $383 \mathrm{~K}$ is :

(Specific heat of water liquid and water vapour are $4.2 \mathrm{~kJ} \mathrm{~K}^{-1} \mathrm{~kg}^{-1}$ and $2.0 \mathrm{~kJ} \mathrm{~K}^{-1} \mathrm{~kg}^{-1}$; heat of liquid fusion and vapourisation of water are $344 \mathrm{~kJ} \mathrm{~kg}^{-1}$ and $2491 \mathrm{~kJ} \mathrm{~kg}^{-1}$, respectively).

$(\log 273=2.436, \log 373=2.572, \log 383=2.583$ )

1. $7.90 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}$

2. $2.64 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}$

3. $8.49 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}$

4. $4.26 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}$

Correct Option: , 4

Solution: