Ethanethiol (C2 H5 SH ;. also called ethyl mercaptan) is...

Ethanethiol $\left(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{SH} ;\right.$ also called ethyl mercaptan) is commonly added to natural gas to provide the "rotten egg" smell of a gas leak. The boiling point of ethanethiol is $35^{\circ} \mathrm{C}$ and its heat of vaporization is $27.5 \mathrm{~kJ} / \mathrm{mol}$. What is the entropy of vaporization for this substance?

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Key Concepts

Entropy of Vaporization

This is a thermodynamic quantity that represents the change in entropy when a substance transitions from the liquid phase to the gas phase at its boiling point. It can be calculated using the relation ?S = ?H/T, where ?H is the enthalpy of vaporization and T is the absolute temperature. This quantity provides insight into the degree of disorder or randomness introduced during the vaporization process.

Heat of Vaporization

This refers to the amount of energy required to convert one mole of a liquid into gas at constant pressure. It is a measure of the energy needed to overcome the intermolecular forces present in the liquid. In thermodynamic calculations, it acts as a critical parameter for determining other properties such as the entropy change during vaporization.

Boiling Point

The boiling point is the specific temperature at which a liquid's vapor pressure equals the surrounding atmospheric pressure, allowing the liquid to transition into the gas phase. In thermodynamics, the boiling point is pivotal because it marks the condition under which the enthalpy and entropy of vaporization are typically measured and calculated.

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