You want to prepare an aqueous solution of ethylene glycol, HOCH2 CH2 OH, in which the mole frac

Name: Problem 8, Chapter 13: Chemistry and Chemical Reactivity
Uploaded: 2020-08-07T21:27:21-08:00
Duration: 3 min 21 s
Channel: Catherine Lemar
Description: You want to prepare an aqueous solution of ethylene glycol, HOCH2 CH2 OH, in which the mole fraction of solute is 0.125 . What mass of ethylene =glycol, in grams, should you combine with 955 g -of water? What is the molality of the solution?

step 1 We have a mole fraction of 0 .125, and we know the number of moles of water. We have 955 grams,

Question

You want to prepare an aqueous solution of ethylene glycol, $\mathrm{HOCH}_{2} \mathrm{CH}_{2} \mathrm{OH},$ in which the mole fraction of solute is $0.125 .$ What mass of ethylene =glycol, in grams, should you combine with $955 \mathrm{g}$ -of water? What is the molality of the solution?

   You want to prepare an aqueous solution of ethylene glycol, $\mathrm{HOCH}_{2} \mathrm{CH}_{2} \mathrm{OH},$ in which the mole fraction of solute is $0.125 .$ What mass of ethylene =glycol, in grams, should you combine with $955 \mathrm{g}$
-of water? What is the molality of the solution?

Chemistry and Chemical Reactivity

John C. Kotz, Paul… 10th Edition

Chapter 13, Problem 8

Instant Answer

Solved by Expert Catherine Lemar

08/07/2020

Step 1

We know that the molar mass of water is approximately 18 g/mol. Therefore, the number of moles of water is given by the mass of water divided by the molar mass of water. \[ n_{H_2O} = \frac{m_{H_2O}}{M_{H_2O}} = \frac{955 g}{18 g/mol} = 53.1 mol \] Show more…

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You want to prepare an aqueous solution of ethylene glycol, $\mathrm{HOCH}_{2} \mathrm{CH}_{2} \mathrm{OH},$ in which the mole fraction of solute is $0.125 .$ What mass of ethylene =glycol, in grams, should you combine with $955 \mathrm{g}$ -of water? What is the molality of the solution?

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Key Concepts

Mole Fraction

Mole fraction is a way of expressing concentration, defined as the ratio of the moles of one component to the total moles of all components in the mixture. It is a unitless quantity, making it useful for describing the composition of solutions independently of temperature or volume changes.

Molality

Molality is a measure of the concentration of a solution expressed as the number of moles of solute per kilogram of solvent. Unlike molarity, molality is independent of temperature because mass remains constant, making it especially valuable in studies involving temperature variations.

Moles and Molar Mass

The concept of moles and molar mass is fundamental in converting between the mass of a substance and the number of moles. Molar mass serves as the conversion factor, allowing one to calculate the number of moles from a known mass, or vice versa, which is essential for preparing solutions with specific mole-based concentrations.

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