Question

Ethanol, $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$, is known as grain alcohol and is the alcohol found in alcoholic beverages. Calculate the mole fraction of ethanol in a solution that contains $4.76 \mathrm{~g}$ of ethanol dissolved in $50.0 \mathrm{~g}$ of water.

Name: Problem 121, Chapter 12: General Chemistry
Uploaded: 2021-06-26T19:30:46-08:00
Duration: 1 min 40 s
Channel: Lottie Adams
Description: Ethanol, CH3 CH2 OH, is known as grain alcohol and is the alcohol found in alcoholic beverages. Calculate the mole fraction of ethanol in a solution that contains 4.76 g of ethanol dissolved in 50.0 g of water.

   Ethanol, $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$, is known as grain alcohol and is the alcohol found in alcoholic beverages. Calculate the mole fraction of ethanol in a solution that contains $4.76 \mathrm{~g}$ of ethanol dissolved in $50.0 \mathrm{~g}$ of water.

General Chemistry

Darrell Ebbing,… 9th Edition

Chapter 12, Problem 121

Instant Answer

Solved by Expert Lottie Adams

06/26/2021

Step 1

The molar mass of ethanol (C2H5OH) is 46.07 g/mol, and the molar mass of water (H2O) is 18.02 g/mol. Moles of ethanol = mass / molar mass = 4.76 g / 46.07 g/mol = 0.103 mol Moles of water = mass / molar mass = 50.0 g / 18.02 g/mol = 2.77 mol Show more…

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Ethanol, $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$, is known as grain alcohol and is the alcohol found in alcoholic beverages. Calculate the mole fraction of ethanol in a solution that contains $4.76 \mathrm{~g}$ of ethanol dissolved in $50.0 \mathrm{~g}$ of water.

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Key Concepts

Mole Fraction

Mole fraction is a way of expressing the concentration of a component in a solution. It is defined as the number of moles of the component divided by the total number of moles of all components, providing a dimensionless ratio that indicates the relative amount of that component.

Moles and Molar Mass

This concept involves converting the mass of a substance to moles by dividing the mass by the substance's molar mass. It is fundamental in stoichiometry and solution chemistry because it allows one to quantify the number of particles present in a given mass.

Solution Concentration

This refers to the measure of how much solute is present in a given amount of solvent or solution. In this context, the mole fraction is used as a measure of concentration, which is particularly useful for understanding the properties of mixtures and solutions that depend on the relative numbers of particles.

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