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Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

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BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 4, Problem 35E
Textbook Problem
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The active ingredient in aspirin is acetylsalicylic acid, which has the chemical formula C 9 H 8 O 4 . An aspirin pill contains 300.0 mg of acetylsalicylic acid. How many moles of acetylsalicylic acid does it contain?

Interpretation Introduction

Interpretation:

The number of moles of acetylsalicylic acid in the given sample of aspirin pill is to be determined.

Concept Introduction:

The characteristic mass of a compound is considered the formula mass of that compound, which is obtained by adding the atomic masses of all its atoms.

A conversion factor is a numerical ratio which is used in order to change one unit into another.

The formula mass of a compound in amu is considered numerically equal to its molar mass in gram/mol.

Explanation of Solution

Given information: An aspirin pill contains 300.0 mg. of acetylsalicylic acid.

The acetylsalicylic acid is considered an active ingredient in aspirin which has the molecular formula C9H8O4. The number of molecules of acetylsalicylic acid can be calculated with the help of Avogadro’s number as follows:

0.3g×1mole180.17g×6.022×1023moleculesmole=1.002×1021molecules

Here,

Molar mass of acetylsalicylic acid =180

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Chapter 4 Solutions

Chemistry In Focus
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