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Calculate the empirical formula for each over-the-counter

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 94P Chapter 6

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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Problem 94P

Calculate the empirical formula for each over-the-counter pain reliever

(a) acetaminophen (Tylenol): C, 63.56%; H, 6.00%; N, 9.27%; O, 21.17%

(b) naproxen (Aleve): C, 73.03%; H, 6.13%; O, 20.84%

Step-by-Step Solution:

Solution 94P

Here, we are going to calculate the empirical formula for the given pain relievers..

Step 1:

Empirical formula gives the simplest ratio of elements in a compound.

Step 2:

In order to determine the whole number ratio of C, H, N and O in the formula, the following table is drawn:

Element

%

Relative number of atoms(% / atomic mass)

Simple ratio

Whole number ratio

C

63.56

63.56/12 = 5.3

5.3/0.66 = 8.03

8

H

6.00

6.00/1 = 6.00

6/0.66 = 9.09

9

N

9.27

9.27/14 = 0.66

0.66/0.66 = 1

1

O

21.17

21.17/16 = 1.32

1.32/0.66 = 2

2

Hence, empirical formula of acetaminophen(Tylenol) is C8H9NO2.

Step 3 of 3

Chapter 6, Problem 94P is Solved
Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

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