Explanation Molarity: The number of moles of solute per liter of solution is known as molarity of the solution. It symbolized by M . Molarity of any solution is a ratio of moles of solutes per liter of solution. It is expressed by the following formula: Molarity ( M ) = moles of solutes liter of solution Density: The density of a substance is equal to the ratio of its mass and volume. In general we can say the density of a substance is mass per unit volume. density ( g cm 3 ) = mass (g) volume (cm 3 ) or mass (g) volume (mL) Mass percentage: Mass percentage is concentration expression of solute which may be percentage of the mass of the solution. It expressed by the following formula: Mass percentage of solute = grams of solute grams of solution × 100 % The concentration and the volume of dilute and concentrated solution are given as follows: C 1 V 1 = C 2 V 2 Concentrated solution Dilute solution a. Given: The mass of evaporating dish is 24.10 g and the mass of evaporating dish with NaCl is 25.50 g. Calculation: First calculate the mass of NaCl as follows: Mass of NaCl = 25 .50 g − 24 .10 g = 1 .4 g If assume that the density of the solution is same as water then the mass of solution is 10 g. Now calculate the mass percentage of the solution as follows: Mass percentage of solute = grams of solute grams of solution × 100 % Mass percentage of NaCl = 1 .4 grams 10 .0 grams of solution × 100 % = 14 % b. Given: The mass of evaporating dish is 24.10 g and the mass of evaporating dish with NaCl is 25.50 g. Calculation: First calculate the mass of NaCl as follows: Mass of NaCl = 25 .50 g − 24 .10 g = 1 .4 g Calculate the number of moles of salt by its molar mass: Molar mass of NaCl = 58

CHEMISTRY: AN INTRODUCTION TO GENERAL, O

13th Edition

ISBN: 9780137444298

Author: Timberlake

Publisher: PEARSON

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Chapter 9, Problem 9.113CP

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To determine:

The mass percentage of the NaCl solution

The molarity of the NaCl solution

The molarity of the diluted NaCl solution

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Chapter 9, Problem 9.112APP

Chapter 9, Problem 9.114CP

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CHEMISTRY: AN INTRODUCTION TO GENERAL, O

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The mass percentage of the NaCl solution The molarity of the NaCl solution The molarity of the diluted NaCl solution

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To determine: The mass percentage of the NaCl solution The molarity of the NaCl solution The molarity of the diluted NaCl solution

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Chapter 9 Solutions

To determine:

The mass percentage of the NaCl solution

The molarity of the NaCl solution

The molarity of the diluted NaCl solution