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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Concentrated sulfuric acid has a density of 1.84 g/cm3 and is 95.0% by weight H2SO4. What is the molality of this acid? What is its molarity?

Interpretation Introduction

Interpretation: The molarity and molality of H2SO4 to be identified.

Concept introduction:

Molarity: It is defined as the number of moles per liter of the solution.

Molarity=nV

Molality: The amount of solute (mol) per kilogram of solvent.

Concentration (C, mol/kg) =  molality of solute = Amount of solute (mol)Mass of solvent (Kg)

Explanation

The molarity:

Given data:

weight % of H2SO4= 95%density=1.84g/cm3=1.84g/ml3=1840 g/L

Thus weight of H2SO4 is 1840gin1L of solution.

Given that H2SO4 is present 95% by weight in the solution.

0.95×1840=1748g

Molarity is defined as the number of moles per liter of the solution.

Molarity=nV

No.ofmoles=massmolarmass

Molarity=(1748 g/ 98g.mol-1)1L=17

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