   # What quantity of ethylene glycol, HOCH 2 CH 2 OH, must be added to 125 g of water to raise the boiling point by 1.0 °C? Express the answer in grams. ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 13.4, Problem 2CYU
Textbook Problem
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## What quantity of ethylene glycol, HOCH2CH2OH, must be added to 125 g of water to raise the boiling point by 1.0 °C? Express the answer in grams.

Interpretation Introduction

Interpretation: The quantity of ethylene glycol added in the water to raise the boiling point by 1.0oC has to be identified.

Concept introduction:

Boiling point elevation: The expression that depicts the relationship between boiling point of the solution varies with the solute concentration is shown as follows,

Elevation in boiling point = ΔTbp= Kbp. msolute

Here, Kbp is molal boiling point elevation constant.

msoluteis molality of the solute.

### Explanation of Solution

Given:

Mass of Water (solvent) =125 g = 0.125 kg Boilingpointofwaterincreased by, ΔTbp = 1.0oCMass of Ethylene glycol (solute) = ?

Boiling point elevation:¯Elevation in boiling point = ΔTbp= Kbp. msolute,

From the above equation, mass of the solute can be calculated.

1.0oC=+0.5121oC/mmsolutemsolute=1.0oC+0.5121oC/mmsolute = 1.95mHere, Kbpconstant value for water=+0.5121oC/m

Number of moles of glycol can be calculated as given below:

Moles of solute (mol) = molalityAmount of solventin kg                                    = 1.95m0.125 kg                                    = 0

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