Isopropyl alcohol, CH3 CHOHCH3, is used in rubbing alcohol...

Isopropyl alcohol, $\mathrm{CH}_{3} \mathrm{CHOHCH}_{3},$ is used in rubbing alcohol mixtures. Alcohol on the skin cools by evaporation. How much heat is absorbed by the alcohol if $4.39 \mathrm{~g}$ evaporates? The heat of vaporization of isopropyl alcohol is $42.1 \mathrm{~kJ} / \mathrm{mol}$.

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Key Concepts

Heat of Vaporization

Heat of vaporization is the amount of energy required to convert a substance from its liquid phase to its vapor phase at a constant temperature. This energy is absorbed by the substance during the phase change without resulting in an increase in temperature, and it is typically expressed in units such as kJ/mol.

Molar Mass and Mole Conversion

Molar mass is the mass of one mole of a substance, which allows the conversion of a sample's mass into the number of moles. This conversion is crucial when using per-mole thermodynamic constants, since it provides a bridge between the macroscopic amount (in grams) and microscopic quantity (in moles) needed for calculations.

Energy Calculation in Phase Transitions

Calculating the energy absorbed during a phase transition involves multiplying the number of moles of the substance by its heat of vaporization. This method integrates the concepts of moles and latent heat to determine the total energy required for the phase change process.

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