The change in entropy, in the conversion of one mole of water at 373 K to vapour at the same te

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The change in entropy, in the conversion of one mole of...

The change in entropy, in the conversion of one mole of water at $373 \mathrm{~K}$ to vapour at the same temperature is (Latent heat of vaporization of water = $\left.2.257 \mathrm{~kJ} \mathrm{~g}^{-1}\right)$ (a) $99 \mathrm{JK}^{-1}$ (b) $129 \mathrm{JK}^{-1}$ (c) $89 \mathrm{JK}^{-1}$ (d) $109 \mathrm{JK}^{-1}$

The change in entropy, in the conversion of one mole of water at $373 \mathrm{~K}$ to vapour at the same temperature is (Latent heat of vaporization of water = $\left.2.257 \mathrm{~kJ} \mathrm{~g}^{-1}\right)$
(a) $99 \mathrm{JK}^{-1}$
(b) $129 \mathrm{JK}^{-1}$
(c) $89 \mathrm{JK}^{-1}$
(d) $109 \mathrm{JK}^{-1}$

Key Concepts

Entropy

Entropy is a thermodynamic property that quantifies the degree of randomness or disorder in a system. It is a measure of how energy is dispersed at a specific temperature and plays a central role in determining the direction of spontaneous processes, particularly in reversible transformations where the change in entropy is directly linked to the heat exchanged during a phase change.

Latent Heat of Vaporization

Latent heat of vaporization is the amount of heat required to convert a unit mass of a substance from liquid to vapor at constant temperature and pressure, without changing its temperature. This concept is crucial in phase change processes as it directly influences the energy exchanges and consequent changes in the system's entropy.

Molar Conversion

Molar conversion involves translating the latent heat given per gram into a value per mole by using the molar mass of the substance. This process is essential when applying thermodynamic formulas that require consistent units, ensuring that energy values correspond correctly to the chemical amount being considered.

Thermodynamic Calculation of Entropy Change

The calculation of entropy change in a phase transition uses the relation ?S = Q/T, where Q is the heat absorbed or released and T is the absolute temperature at which the process occurs. This concept highlights how energy exchange during a phase change, such as vaporization, impacts the overall disorder of the system.

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