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Solved: Determining a Molecular Formula Mesitylene, a

Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro ISBN: 9780321809247 1

Solution for problem 2PE Chapter 3.14SE

Chemistry: A Molecular Approach | 3rd Edition

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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro

Chemistry: A Molecular Approach | 3rd Edition

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Problem 2PE

Determining a Molecular Formula Mesitylene, a hydrocarbon found in crude oil, has an empirical formula of C3H4 and an experimentally determined molecular weight of 121 amu. What is its molecular formula? Ethylene glycol, used in automobile antifreeze, is 38.7% C, 9.7% H, and 51.6% 0 by mass. Its molar mass is 62.1 g/mol. (a) What is the empirical formula of ethylene glycol? (b) What is its molecular formula?

Step-by-Step Solution:

Answer: Step 1 Mesitylene or 1,3,5-trimethylbenzene is a derivative of benzene with three methyl substituents positioned symmetrically around the ring. The other two isomeric trimethylbenzenes are 1,2,4-trimethylbenzene (pseudocumene) and 1,2,3-trimethylbenzene (hemi melitene). All three compounds have the formula C H (CH 6 3whic3 3commonly abbreviated C H Me . Mesityle6 3 3 is a colourless liquid with sweet aromatic odor. It is a component of coal tar, which is its traditional source. It is a precursor to diverse fine chemicals. The mesityl group (Mes) is a substituent with the formula C H Me and is found in various other compounds. 6 2 3 Step 2 To know the molecular formula of a compound we have to know the empirical formula of a compound. We are given an empirical formula and a molecular weight of a compound and asked to determine its molecular formula. Step 3 The subscripts in a compound’s molecular formula are whole-number multiples of the subscripts in its empirical formula. We find the appropriate multiple by using Equation Whole-number multiple = molecular weight/ empirical formula weight. The formula weight of the empirical formula C3H4 is 3112.0 amu 2+411.0 amu2 = 40.0 amu Whole-number multiple = molecular weight/ empirical formula weight = 121 40.0 = 3.03

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Chapter 3.14SE, Problem 2PE is Solved
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Textbook: Chemistry: A Molecular Approach
Edition: 3
Author: Nivaldo J. Tro
ISBN: 9780321809247

This textbook survival guide was created for the textbook: Chemistry: A Molecular Approach, edition: 3. This full solution covers the following key subjects: formula, Molecular, its, glycol, mass. This expansive textbook survival guide covers 82 chapters, and 9464 solutions. The full step-by-step solution to problem: 2PE from chapter: 3.14SE was answered by , our top Chemistry solution expert on 02/22/17, 04:35PM. The answer to “Determining a Molecular Formula Mesitylene, a hydrocarbon found in crude oil, has an empirical formula of C3H4 and an experimentally determined molecular weight of 121 amu. What is its molecular formula? Ethylene glycol, used in automobile antifreeze, is 38.7% C, 9.7% H, and 51.6% 0 by mass. Its molar mass is 62.1 g/mol. (a) What is the empirical formula of ethylene glycol? (b) What is its molecular formula?” is broken down into a number of easy to follow steps, and 68 words. Chemistry: A Molecular Approach was written by and is associated to the ISBN: 9780321809247. Since the solution to 2PE from 3.14SE chapter was answered, more than 347 students have viewed the full step-by-step answer.

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