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# Formic acid is responsible for the sting you feel when ISBN: 9780321910295 34

## Solution for problem 109P Chapter 10

Introductory Chemistry | 5th Edition

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Problem 109P

PROBLEM 109P

Formic acid is responsible for the sting you feel when stung by fire ants. By mass, formic acid is 26.10% C, 4.38% H, and 69.52% O. The molar mass of formic acid is 46.02 g/mol. Find the molecular formula of formic acid and draw its Lewis structure.

Step-by-Step Solution:

Solution 109P

Here, we are going to find the molecular formula of formic acid and draw its Lewis structure.

Step 1:

Molecular formula gives the total number of atoms in a molecule.

Step 2:

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

 Element % Relative number of atoms(% / atomic mass) Simple ratio Whole number ratio C 26.10 26.10/12 = 2.175 2.175/2.175 = 1 1 H 4.38 4.38/1 = 4.38 4.38/2.175 = 2.01 2(approx.) O 69.52 69.52/16 = 4.345 4.345/2.175 = 1.99 2(approx.)

Hence, empirical formula of formic acid is CH2O2.

Step 3:

Now, empirical formula mass = (1 x atomic mass of C) + (2 x atomic mass of H) + (2 x atomic mass of O)

= 12 + (2 x 1) + (2 x 16)

= 12 + 2 + 32

= 46

Molar mass of the formic acid = 46.02 g/mol

Let the molecular formula of formic acid be (CH2O2)n

n = = 46.02 / 46

= 1 (approx.)

Step 4 of 5

Step 5 of 5

##### ISBN: 9780321910295

This full solution covers the following key subjects: acid, formic, mass, lewis, Find. This expansive textbook survival guide covers 19 chapters, and 2045 solutions. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. Since the solution to 109P from 10 chapter was answered, more than 458 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 109P from chapter: 10 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM. This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. The answer to “Formic acid is responsible for the sting you feel when stung by fire ants. By mass, formic acid is 26.10% C, 4.38% H, and 69.52% O. The molar mass of formic acid is 46.02 g/mol. Find the molecular formula of formic acid and draw its Lewis structure.” is broken down into a number of easy to follow steps, and 47 words.

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