   # Eugenol is the major component in oil of cloves. It has a molar mass of 164.2 g/mol and is 73.14% C and 737% H; the remainder is oxygen. What are the empirical and molecular formulas of eugenol? (a) C 5 H 6 O, C 5 H 6 O (b) C 5 H 6 O, C 10 H 12 O 2 (c) C 6 H 5 O, C 12 H 10 ,O 2 (d) C 3 H 6 O, C 6 H 12 O 2 ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 2.10, Problem 3RC
Textbook Problem
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## Eugenol is the major component in oil of cloves. It has a molar mass of 164.2 g/mol and is 73.14% C and 737% H; the remainder is oxygen. What are the empirical and molecular formulas of eugenol? (a) C5H6O, C5H6O (b) C5H6O, C10H12O2 (c) C6H5O, C12H10,O2 (d) C3H6O, C6H12O2

Interpretation Introduction

Interpretation: The empirical formula and molecular formula of eugenol is to be identified from the given options.

Concept introduction:

• Empirical formula of a compound represents the smallest whole number relative ratio of elements in that compound.
• Equation for finding Molecular formula from the empirical formula,

MolarmassEmpiricalformula mass × Empirical formula

• Equation for number moles from mass and molar mass,

Numberofmoles=MassingramsMolarmass

Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.

### Explanation of Solution

Mass percent of C, H and O in eugenol is given as 73.14% , 7.37% and 100(73.14+7.37)%=19.49% respectively.

Mass percent of an element means, 100g of compound contains that mass percent of an element in grams. Therefore, mass of C, H and O are 73.14g, 7.37g and 19.49g respectively in 100g of eugenol.

Equation for number moles from mass and molar mass is,

Numberofmoles=MassingramsMolarmass

Therefore,

The number of moles of C is,

Numberofmoles=73.14g12.01g/mol=6.09mol

The number of moles of H is,

Numberofmoles=7.37g1.008g/mol=7.31mol

The number of moles of O is,

Numberofmoles=19.49g16g/mol=1.2mol

So, the mole ratio between elements in eugenol is,

C:H:O=6.09:7.31:1

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