   # Calculate the mass percent of each element in the following compounds: (a) PbS, lead(I1) sulfide, galena (b) C 3 H 8 , propane (c) C 10 H 14 O, carvone, found in caraway seed oil ### 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, Problem 79PS
Textbook Problem
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## Calculate the mass percent of each element in the following compounds:(a) PbS, lead(I1) sulfide, galena(b) C3H8, propane(c) C10H14O, carvone, found in caraway seed oil

(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 of Solution

The molecule lead (II) sulfide PbS contains one lead and one sulfur atoms, so the molar mass of the compound can be written as,

1×207.2(Pb)+1×32.06g(S)=239.26g(PbS)

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

(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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