Entropy is defined as the quantitative physical property, which is unavailable to perform any work. It is also defined as the number of possible arrangements of atoms in a system.
The correct answer is:
Option 2. 1 mole of KNO₃ (s)
Entropy is dependent on:
- Entropy increases with an increase in molecular weight and temperature.
- Entropy for the solid-state will be least, as compared to liquids and gases. Gases have the highest entropies due to random movements of the particles.
- In solids, the atoms are compactly packed and have negligible movement. Thus, the solids will have the lowest entropy.
Therefore, option 2, 1 mole of KNO₃ (s) will have the lowest entropy.
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