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# Formic acid is responsible for the sting of ant bites. By ISBN: 9780321809247 1

## Solution for problem 91E Chapter 9

Chemistry: A Molecular Approach | 3rd Edition

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Problem 91E

Formic acid is responsible for the sting of ant bites. 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 91E Step 1 of 5 The mass percentage can be used to obtain the ratio between the elements involved in forming a compound. Step 2 of 5 Since we know the mass percentages, it is reasonable that in 100 g of compound we have 26.10 g of C 4.38 g of H 69.52 g of O Now we can calculate the number of moles for each element moles of C= Mass of C/(Atomic mass of C)= 26.10 g/ (12.01g/mol)=2.17 moles of H= Mass of H/(Atomic mass of H)= 4.38 g/ (1.008g/mol)=4.35 moles of O= Mass of O/(Atomic mass of O)= 69.52 g/ (16.00g/mol)=4.35 Step 3 of 5 Since the C has the lower number of mole, we can use this number as reference to know the ratio between these three elements. We have to divide all the numbers of moles obtained in the step 2 for the lowest value. So we obtain a C:H:O ratio that is 1:2:2. Thus we have on atom of C, 2 atoms of H and 2 atoms of O. Thus the empirical formula is CH O2 2

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##### ISBN: 9780321809247

The answer to “Formic acid is responsible for the sting of ant bites. 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 43 words. Chemistry: A Molecular Approach was written by and is associated to the ISBN: 9780321809247. The full step-by-step solution to problem: 91E from chapter: 9 was answered by , our top Chemistry solution expert on 02/22/17, 04:35PM. This textbook survival guide was created for the textbook: Chemistry: A Molecular Approach, edition: 3. Since the solution to 91E from 9 chapter was answered, more than 725 students have viewed the full step-by-step answer. This full solution covers the following key subjects: acid, formic, mass, lewis, Find. This expansive textbook survival guide covers 82 chapters, and 9464 solutions.

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