Chemistry
Chemistry
12th Edition
ISBN: 9780078021510
Author: Raymond Chang Dr., Kenneth Goldsby Professor
Publisher: McGraw-Hill Education
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Chapter 12.3, Problem 5PE
Interpretation Introduction

Interpretation: The molality of 44.6 percent solution of NaCl should be calculated.

Concept Introduction:

Molality(m): The concentration for solutions is expressed in terms of molality. Molality is the number of moles of solute present in one kilogram of solvent. Molality is estimation of moles in relationship with solvent in the solution.

Molality (m) =Numberofmolesofsolutekilogramsofsolvent

Percent by mass: It is the ratio of solute mass to the solution mass which finally multiplied by 100. The formula for percent by mass calculation is as follows,

Percent mass =MassofsoluteMass of solution×100%Mass of solution = Mass of solute + Mass of solvent

Moles: One mole is equivalent to the mass of the substance consists same number of units equal to the atoms present in 12g of 12C.

From given mass of substance moles could be calculated by using the following formula,

Molesofsubstance GivenmassofsubstanceMolecularmass

Mass: It is the quantitative measure of a substance. The amount of matter present in substance is expressed as mass. The S.I. unit of mass is kg.

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