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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

A solution is prepared by dissolving 52.3 g cesium chloride in 60.0 g water. The volume of the solution is 63.3 mL. Calculate the mass percent, molarity, molality, and mole fraction of the CsCl solution.

Interpretation Introduction

Interpretation: The mass percent, molality, molarity and mole fraction of Cesium chloride has to be calculated.

Concept introduction:

The mass percent can be defined as the mass of solute in grams to the total mass of solute in grams is multiply in 100 . It can be given by the equation,

Mass %=Massofsolue(ing)Totalmass(in g)×100

Molality of a solution also called as molal concentration can be defined as the mass of solute in grams to the mass of the solvent in kilograms. It can be given by the equation,

Molality(molkg-1)=Massofsolue(ing)Massofsolvent(inkg)

Molarity can be defined as the moles of solute (in grams) to the volume of the solution (in litres). The molarity of a solution can be given by the formula,

Molarity(M)=Molesofsolute(ing)Volumeofsolution(inL)

Mole fraction of a compound can be defined as the number of moles of a substance to the total number of moles present in them. The mole fraction can be calculated by,

Molefractionofcompound=Numberofmoles(inmol)Totalnumberofmoles(inmol)

Explanation

Record the given info

Weight of CsCl = 52.3g

Weight of water = 60g

To calculate the mass percent of CsCl

Mass percent of CsCl

=52.3g52.3g+60g×100=46.6%

The mass percent of CsCl is 46.6%

Record the given info

Mass of CsCl = 52.3g

Mass of water= 60g

Volume of solution = 63.3mL

Molecular weight of CsCl = 168.4g

To calculate the moles of CsCl

MolCsCl=52.31mole168.4g=0.311moleCsCl

The moles of CsCl is calculated by plugging in the values of Mass of CsCl and molecular weight of CsCl . Hence the moles of CsCl

is 0.311mole .

To calculate the molality of CsCl

Mass of water= 60g

Moles of CsCl = 0.311mole

Molality of CsCl = moleCsClkgsolvent×0.311moleCsCl0.0600kg=5.18mol/kg

Molality of CsCl =5

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