Question

Acetone, $\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O},$ is a highly volatile solvent sometimes used as a cleansing agent prior to vaccination. It evaporates quickly from the skin, making the skin feel cold. How much energy is absorbed by $23.8 \mathrm{g}$ of acetone as it evaporates if its molar heat of vaporization is $32.0 \mathrm{kJ} / \mathrm{mol} ?$

Name: Problem 67, Chapter 15: Introductory Chemistry: An Active Learning Approach
Uploaded: 2020-10-24T15:20:31-08:00
Duration: 2 min 34 s
Channel: Shazia Naz
Description: Acetone, C3 H6 O, is a highly volatile solvent sometimes used as a cleansing agent prior to vaccination. It evaporates quickly from the skin, making the skin feel cold. How much energy is absorbed by 23.8 g of acetone as it evaporates if its molar heat of vaporization is 32.0 kJ / mol ?

   Acetone, $\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O},$ is a highly volatile solvent sometimes used as a cleansing agent prior to vaccination. It evaporates quickly from the skin, making the skin feel cold. How much energy is absorbed by $23.8 \mathrm{g}$ of acetone as it evaporates if its molar heat of vaporization is $32.0 \mathrm{kJ} / \mathrm{mol} ?$

Introductory Chemistry: An Active Learning Approach

Mark S. Cracolice,… 3rd Edition

Chapter 15, Problem 67

Instant Answer

Solved by Expert Shazia Naz

10/24/2020

Step 1

We can do this using the molar mass of acetone, which is $58.8 \, \mathrm{g/mol}$. The formula to convert mass to moles is: \[ \text{moles} = \frac{\text{mass}}{\text{molar mass}} \] So, we have: \[ \text{moles of acetone} = \frac{23.8 \, \mathrm{g}}{58.8 \, Show more…

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Acetone, $\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O},$ is a highly volatile solvent sometimes used as a cleansing agent prior to vaccination. It evaporates quickly from the skin, making the skin feel cold. How much energy is absorbed by $23.8 \mathrm{g}$ of acetone as it evaporates if its molar heat of vaporization is $32.0 \mathrm{kJ} / \mathrm{mol} ?$

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Key Concepts

Stoichiometry

Stoichiometry is the quantitative relationship between the mass of a substance and the number of moles, based on its molar mass. This concept is crucial for converting the mass of a substance into moles, which then allows for the use of molar thermodynamic properties in calculations.

Molar Heat of Vaporization

The molar heat of vaporization is defined as the energy required to transform one mole of a liquid into vapor at a constant temperature. It reflects the intermolecular forces present in the liquid and is a key parameter in determining the energy exchange during phase transitions.

Phase Change Energy Calculation

Phase change energy calculations involve combining stoichiometry with the molar heat of vaporization. By determining the number of moles present in a given mass and multiplying by the heat of vaporization per mole, one can calculate the total energy absorbed or released during the phase change.

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