Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN: 9781285199047
Author: John W. Moore, Conrad L. Stanitski
Publisher: Cengage Learning
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Chapter 2, Problem 87QRT

(a)

Interpretation Introduction

Interpretation:

The molar mass of the compound PbS, lead (II) sulfide (galena) and mass percent of each element present in the compound has to be calculated.

(a)

Expert Solution
Check Mark

Explanation of Solution

The given compound is PbS, lead (II) sulfide (galena).

Mass of lead is 207.2g/mol.

Mass of sulfur is 32.065g/mol.

Molar mass of PbS = 207.2g/molPb+32.065g/molS=239.3g/molPbS.

Then,

Mass percent of Pb

  =massofPbpermolofPbSmassofPbSpermolPbS×100%=207.2gPb239.3gPbS×100%=86.58%PbinPbS.

Mass percent of S =100%-86.58%=13.41%SinPbS.

(b)

Interpretation Introduction

Interpretation:

The molar mass of the given compound C2H6 and mass percent of each element present in the compound has to be calculated.

(b)

Expert Solution
Check Mark

Explanation of Solution

The given compound is C2H6, ethane, a hydrocarbon fuel.

Mass of carbon is 12.0107g/mol.

Mass of hydrogen is 1.0079g/mol.

Molar mass of C2H6 = (2×12.0171)g/molC+(1×1.0079)g/molH=30.688g/molC2H6.

Then,

Mass percent of C

=massofCpermolofC2H6massofC2H6permolC2H6×100%=24.0214gC30.0688gC2H6×100%=79.8881%CinC2H6.

Mass percent of C =100%-79.8881%=20.1119%C.

(c)

Interpretation Introduction

Interpretation:

The molar mass of the given compound CH3COOH and mass percent of each element present in the compound has to be calculated.

(c)

Expert Solution
Check Mark

Explanation of Solution

The given compound is CH3COOH, acetic, an important ingredient in vinegar.

Mass of carbon is 12.0107g/mol.

Mass of hydrogen is 1.0079g/mol.

Mass of oxygen is 15.9994g/mol

Molar mass of CH3COOH =

(2×12.0171)g/molC+(4×1.0079)g/molH+(2×15.9994)g/molO=60.0518g/molCH3COOH.

Then,

Mass percent of C

=massofCpermolofC2H6massofC2H6permolC2H6×100%=24.0214gC60.0518gCH3COOH×100%=40.0011%CinCH3COOH.

Mass percent of H

=massofHpermolofCH3COOHmassofCH3COOHpermolCH3COOH×100%=4.0316gH60.0518gCH3COOH×100%=6.7135%HinCH3COOH.

Mass percent of O =100%-79.8881%-6.7135%=53.284%O.

(d)

Interpretation Introduction

Interpretation:

The molar mass of the given compound NH4NO3 and mass percent of each element present in the compound has to be calculated.

(d)

Expert Solution
Check Mark

Explanation of Solution

The given compound is NH4NO3, ammonium nitrate, a fertilizer.

Mass of nitrogen is 14.0067g/mol.

Mass of hydrogen is 1.0079g/mol.

Mass of oxygen is 15.9994g/mol

Molar mass of NH4NO3 =

(2×14.0067)g/molN+(4×1.0079)g/molH+(3×15.9994)g/molO=80.0432g/molNH4NO3.

Then,

Mass percent of N

=massofNpermolofNH4NO3massofNH4NO3permolNH4NO3×100%=4.0316gN80.0432gNH4NO3×100%=34.9919%NinNH4NO3.

Mass percent of H

=massofHpermolofNH4NO3massofNH4NO3permolNH4NO3×100%=4.0316gH80.0432gNH4NO3×100%=5.0368%HinNH4NO3.

Mass percent of O =100%-34.9979%-5.0368%=59.9654%O.

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Chapter 2 Solutions

Chemistry: The Molecular Science

Ch. 2.4 - Prob. 2.6PSPCh. 2.4 - Prob. 2.6CECh. 2.4 - Prob. 2.7PSPCh. 2.4 - Prob. 2.8PSPCh. 2.5 - Prob. 2.9PSPCh. 2.5 - Prob. 2.10PSPCh. 2.6 - Prob. 2.7CECh. 2.7 - Prob. 2.8CECh. 2.7 - Prob. 2.11PSPCh. 2.7 - Prob. 2.9ECh. 2.8 - Prob. 2.12PSPCh. 2.8 - Prob. 2.10ECh. 2.9 - Prob. 2.11ECh. 2.9 - Prob. 2.12ECh. 2.9 - Prob. 2.13CECh. 2.9 - According to Table 2.10, five constitutional...Ch. 2.11 - Calculate (a) the amount of Ti atoms in 4.00 g...Ch. 2.11 - Prob. 2.15CECh. 2.11 - Prob. 2.16ECh. 2.11 - Prob. 2.17CECh. 2.11 - Prob. 2.18ECh. 2.11 - Prob. 2.19ECh. 2.11 - Prob. 2.14PSPCh. 2.11 - Prob. 2.15PSPCh. 2.11 - Prob. 2.16PSPCh. 2.11 - Prob. 2.20CECh. 2.12 - Prob. 2.17PSPCh. 2.12 - Prob. 2.18PSPCh. 2.12 - Prob. 2.21ECh. 2.12 - Hydrazine is composed of 87.42% nitrogen and...Ch. 2.12 - Prob. 2.20PSPCh. 2.12 - Prob. 2.22ECh. 2 - An isotope of an element contains 63 protons and...Ch. 2 - Prob. IISPCh. 2 - Prob. IIISPCh. 2 - Dioxathion, a pesticide, contains carbon,...Ch. 2 - Prob. 1QRTCh. 2 - Prob. 2QRTCh. 2 - Prob. 3QRTCh. 2 - Prob. 4QRTCh. 2 - Prob. 5QRTCh. 2 - Prob. 6QRTCh. 2 - Prob. 7QRTCh. 2 - Prob. 8QRTCh. 2 - Prob. 9QRTCh. 2 - Prob. 10QRTCh. 2 - Match these by placing the correct notation in the...Ch. 2 - Prob. 12QRTCh. 2 - Prob. 13QRTCh. 2 - Prob. 14QRTCh. 2 - Prob. 15QRTCh. 2 - Prob. 16QRTCh. 2 - Prob. 17QRTCh. 2 - Prob. 18QRTCh. 2 - Prob. 19QRTCh. 2 - Prob. 20QRTCh. 2 - Prob. 21QRTCh. 2 - Prob. 22QRTCh. 2 - Prob. 23QRTCh. 2 - Prob. 24QRTCh. 2 - Prob. 25QRTCh. 2 - Prob. 26QRTCh. 2 - Prob. 27QRTCh. 2 - Prob. 28QRTCh. 2 - Argon has three naturally occurring isotopes:...Ch. 2 - Prob. 30QRTCh. 2 - Prob. 31QRTCh. 2 - Prob. 32QRTCh. 2 - Prob. 33QRTCh. 2 - Prob. 34QRTCh. 2 - Prob. 35QRTCh. 2 - Prob. 36QRTCh. 2 - Prob. 37QRTCh. 2 - Prob. 38QRTCh. 2 - Prob. 39QRTCh. 2 - Prob. 40QRTCh. 2 - Prob. 41QRTCh. 2 - Prob. 42QRTCh. 2 - Prob. 43QRTCh. 2 - Prob. 44QRTCh. 2 - Prob. 45QRTCh. 2 - Prob. 46QRTCh. 2 - Prob. 47QRTCh. 2 - Prob. 48QRTCh. 2 - Prob. 49QRTCh. 2 - Prob. 50QRTCh. 2 - Prob. 51QRTCh. 2 - Prob. 52QRTCh. 2 - Prob. 53QRTCh. 2 - Prob. 54QRTCh. 2 - Prob. 55QRTCh. 2 - Prob. 56QRTCh. 2 - Prob. 57QRTCh. 2 - Prob. 58QRTCh. 2 - Prob. 59QRTCh. 2 - Prob. 60QRTCh. 2 - Prob. 61QRTCh. 2 - Prob. 62QRTCh. 2 - Prob. 63QRTCh. 2 - Prob. 64QRTCh. 2 - Prob. 65QRTCh. 2 - Prob. 66QRTCh. 2 - Prob. 67QRTCh. 2 - Prob. 68QRTCh. 2 - Prob. 69QRTCh. 2 - Prob. 70QRTCh. 2 - Prob. 71QRTCh. 2 - Prob. 72QRTCh. 2 - Prob. 73QRTCh. 2 - Prob. 74QRTCh. 2 - If you have a ring that contains 1.94 g gold,...Ch. 2 - You have a pure sample of the antiseptic...Ch. 2 - You have a pure sample of apholate, C12H24N9P3, a...Ch. 2 - Prob. 78QRTCh. 2 - Prob. 79QRTCh. 2 - Prob. 80QRTCh. 2 - Prob. 81QRTCh. 2 - Prob. 82QRTCh. 2 - Prob. 83QRTCh. 2 - Prob. 84QRTCh. 2 - Prob. 85QRTCh. 2 - Prob. 86QRTCh. 2 - Prob. 87QRTCh. 2 - Prob. 88QRTCh. 2 - Prob. 89QRTCh. 2 - Prob. 90QRTCh. 2 - Quinine (molar mass = 324.41 g/mol) is used as a...Ch. 2 - Prob. 92QRTCh. 2 - The mineral uraninite is a uranium oxide that is...Ch. 2 - Carbonic anhydrase, an important enzyme in...Ch. 2 - Nitrogen fixation in the root nodules of peas and...Ch. 2 - Disilane, Si2Hx, contains 90.28% silicon by mass....Ch. 2 - Chalky, white crystals in mineral collections are...Ch. 2 - A well-known reagent in analytical chemistry,...Ch. 2 - Prob. 99QRTCh. 2 - Prob. 100QRTCh. 2 - The density of a solution of sulfuric acid is...Ch. 2 - Prob. 102QRTCh. 2 - Prob. 103QRTCh. 2 - Prob. 104QRTCh. 2 - Prob. 105QRTCh. 2 - Prob. 106QRTCh. 2 - Prob. 107QRTCh. 2 - The Statue of Liberty in New York harbor is made...Ch. 2 - Prob. 109QRTCh. 2 - Prob. 110QRTCh. 2 - Prob. 111QRTCh. 2 - Prob. 112QRTCh. 2 - Prob. 113QRTCh. 2 - Prob. 114QRTCh. 2 - Prob. 115QRTCh. 2 - Prob. 116QRTCh. 2 - Prob. 117QRTCh. 2 - Prob. 118QRTCh. 2 - Prob. 119QRTCh. 2 - Prob. 120QRTCh. 2 - Prob. 121QRTCh. 2 - Prob. 122QRTCh. 2 - Prob. 123QRTCh. 2 - Prob. 124QRTCh. 2 - Prob. 125QRTCh. 2 - Prob. 126QRTCh. 2 - Prob. 127QRTCh. 2 - Prob. 128QRTCh. 2 - Prob. 129QRTCh. 2 - The element bromine is Br2, so the mass of a Br2...Ch. 2 - Uranium is used as a fuel, primarily in the form...Ch. 2 - Prob. 132QRTCh. 2 - Hemoglobin is an iron-containing protein (molar...Ch. 2 - There are three naturally occurring isotopes of...Ch. 2 - Prob. 135QRTCh. 2 - Prob. 136QRTCh. 2 - Prob. 137QRTCh. 2 - An adult human body contains 6.0 L blood, which...Ch. 2 - Prob. 139QRTCh. 2 - Prob. 140QRTCh. 2 - Prob. 141QRTCh. 2 - The present average concentration (mass percent)...Ch. 2 - Prob. 144QRTCh. 2 - A 4.22-g mixture of calcium chloride and sodium...Ch. 2 - A certain metal, M, forms two oxides, M2O and MO....Ch. 2 - If you heat Al with an element from Group 6A, an...Ch. 2 - Prob. 2.ACPCh. 2 - The age of the universe is unknown, but some...Ch. 2 - Prob. 2.CCPCh. 2 - Prob. 2.DCPCh. 2 - Prob. 2.ECP
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