   Chapter 2, Problem 79PS

Chapter
Section
Textbook Problem

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

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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