An aqueous solution containing 17.5 g of an unknown

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo Tro

Problem 125P Chapter 13

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo Tro

Introductory Chemistry | 5th Edition

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Problem 125P

An aqueous solution containing 17.5 g of an unknown molecular (nonelectrolyte) compound in 100.0 g of water has a freezing point of −1.8 °C. Calculate the molar mass of the unknown compound.

Step-by-Step Solution:
Step 1 of 3

Solution: Here, we are going to calculate the molar mass of the unknown compound.

Step1:

The freezing point of a substance may be defined as the temperature at which the vapour pressure of the substance in its liquid phase is equal to its vapour pressure in the solid phase.

In order to determine the molar mass of the solute, te following expression can be used:

                                        Kf x w2 x 1000

M2 = ------------------------        -----(1)

            ΔTf x w1

Where, M2 = molar mass of the solute

Kf = freezing point depression constant

w2 = given mass of solute in grams

ΔTf = depression in freezing point

w1 = mass of solvent in grams

Step2:

Freezing point of water...

Step 2 of 3

Chapter 13, Problem 125P is Solved
Step 3 of 3

Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo Tro
ISBN: 9780321910295

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