   Chapter 2, Problem 80PS

Chapter
Section
Textbook Problem

Calculate the mass percent of each element in the following compounds:(a) C8H10N2O2, caffeine(b) C10H20O menthol(c) CoCl2   6 H2O

(a)

Interpretation Introduction

Interpretation: The mass percent of each element in the given molecules are needed to be calculated.

Concept introduction:

• Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.
• Equation for finding molar mass from mass of a molecule and number moles is,

Molarmass=MassingramsNumberofmoles

• Molar mass of a molecule can be calculated from its molecular formula by taking the sum of atomic masses of all the elements present in it.
Explanation

Molar mass of C8H10N2O2 is 194.19g/mol .

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

Therefore,

The mass percent of nitrogen in C8H10N2O2 is,

2×28.014g194.19g×100%=28.85%

The mass percent of hydrogen in C8H10N2O2 is,

10×1.008g194

(b)

Interpretation Introduction

Interpretation: The mass percent of each element in the given molecules are needed to be calculated.

Concept introduction:

• Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.
• Equation for finding molar mass from mass of a molecule and number moles is,

Molarmass=MassingramsNumberofmoles

• Molar mass of a molecule can be calculated from its molecular formula by taking the sum of atomic masses of all the elements present in it.

(c)

Interpretation Introduction

Interpretation: The mass percent of each element in the given molecules are needed to be calculated.

Concept introduction:

• Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.
• Equation for finding molar mass from mass of a molecule and number moles is,

Molarmass=MassingramsNumberofmoles

• Molar mass of a molecule can be calculated from its molecular formula by taking the sum of atomic masses of all the elements present in it.

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