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# Calculate the empirical formula for each over-the-counter ISBN: 9780321910295 34

## Solution for problem 94P Chapter 6

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

##### ISBN: 9780321910295

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