[References]A solution contains 4.20 g of a nonvolatile pure hydrocarbon in 95 g acetone. The boiling points of pure acetone and the solution are 55.95°C and 56.50°C,respectively. The molal boiling point constant of acetone is 1.71°C kg/mol. What is the molar mass of the hydrocarbon?Molar massg/molSubmit AnswerTry Another Version1 item attempt remainingPreviousNext100%近

Answered: A solution contains 4.20 g of a…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.61QE

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[References]
A solution contains 4.20 g of a nonvolatile pure hydrocarbon in 95 g acetone. The boiling points of pure acetone and the solution are 55.95°C and 56.50°C,
respectively. The molal boiling point constant of acetone is 1.71°C kg/mol. What is the molar mass of the hydrocarbon?
Molar mass
g/mol
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Step 1

The elevation in boiling point depends upon the concentration of the solute in the solution and it is related to the molality "m" is given as follows:

$∆ T_{b} = K_{b} \times m$

Given data is as follows:

Mass of the non volatile pure hydrocarbon (solute) = 4.20 g

The mass of the acetone (solvent) = 95 g

The boiling point of the pure acetone $(T_{b}^{°}) = 55.95 ° C$

The boiling point solution $(T_{b}) = 56.50 ° C$

The molal boiling constant of acetone = 1.71 $° C . Kg / mol$

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