Calculate the change in entropy that occurs in the system...

Calculate the change in entropy that occurs in the system when 1.00 mole of isopropyl alcohol $\left(\mathrm{C}_{3} \mathrm{H}_{8} \mathrm{O}\right)$ melts at its melting point $\left(-89.5^{\circ} \mathrm{C}\right) .$ See Table 11.9 for heats of fusion.

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Key Concepts

Entropy

A thermodynamic state function that quantifies the degree of disorder or randomness in a system. It is a central concept in understanding the direction of spontaneous changes and energy dispersal in physical processes.

Phase Transition

A process in which a substance changes from one state of matter to another, such as from solid to liquid. This involves latent heat, which is absorbed or released without changing temperature, and results in an entropy change.

Heat of Fusion

The amount of energy required to melt a substance at its melting point, corresponding to the latent heat absorbed during the phase transition from a solid to a liquid. This energy exchange directly influences the entropy of the system.

Entropy Change Equation (?S = ?H/T)

A key relationship in thermodynamics that expresses the change in entropy (?S) as the ratio of the heat absorbed or released during a process (?H) to the absolute temperature (T) at which the process occurs. This equation is especially relevant during phase transitions.

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