Chemistry: Matter and Change
Chemistry: Matter and Change
1st Edition
ISBN: 9780078746376
Author: Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher: Glencoe/McGraw-Hill School Pub Co
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Chapter 10, Problem 199A
Interpretation Introduction

Interpretation:

Molecular formula of the two given rock samples containing lead and sulfur must be found.

Concept introduction:

Empirical formula of a molecule is the smallest unit which is repeated in the molecule.

Molecular formula =(empirical formula)n where n is the number of times the empirical formula is present in the molecular formula, n can be 1, 2, 3 etc.

Expert Solution & Answer
Check Mark

Answer to Problem 199A

The empirical formulas are Pb2Sand PbS.

Explanation of Solution

For rock sample 1

% of Pb and S are 86.6 and 13.4 respectively.

Thus, this is equal to the mass of Pb and S present in 100 g of the sample.

The number of moles can be calculated using the molar mass. The molar mass of pb and S is 107 g/mol and 32 g/mol respectively.

Therefore,

Moles of Pb =86.6107=0.81.

Moles of S =13.432=0.42.

Smallest mole ratio Pb: S

=0.810.42:0.420.42=1.93:12:1.

Thus empirical formula is Pb2S.

For rock sample 2

% of Pb and S are 76.4 and 23.6 respectively.

Here, mass of Pb and S is 76.4 g and 23.6 g respectively.

The number of moles can be calculated as follows:

Moles of Pb =76.4107=0.71.

Moles of S =23.632=0.74.

Smallest mole ratio Pb: S

=0.710.71:0.740.71=1:1.041:1.

Thus empirical formula is PbS.

Conclusion

Empirical formula of rock salt 1 and 2 are Pb2S and PbS respectively.

Chapter 10 Solutions

Chemistry: Matter and Change

Ch. 10.1 - Prob. 11SSCCh. 10.1 - Prob. 12SSCCh. 10.1 - Prob. 13SSCCh. 10.1 - Prob. 14SSCCh. 10.2 - Prob. 15PPCh. 10.2 - Prob. 16PPCh. 10.2 - Prob. 17PPCh. 10.2 - Prob. 18PPCh. 10.2 - Prob. 19PPCh. 10.2 - Prob. 20PPCh. 10.2 - Prob. 21PPCh. 10.2 - Prob. 22SSCCh. 10.2 - Prob. 23SSCCh. 10.2 - Prob. 24SSCCh. 10.2 - Prob. 25SSCCh. 10.2 - Prob. 26SSCCh. 10.2 - Prob. 27SSCCh. 10.2 - Prob. 28SSCCh. 10.3 - Prob. 29PPCh. 10.3 - Prob. 30PPCh. 10.3 - Prob. 31PPCh. 10.3 - Prob. 32PPCh. 10.3 - Prob. 33PPCh. 10.3 - Prob. 34PPCh. 10.3 - Prob. 35PPCh. 10.3 - Prob. 36PPCh. 10.3 - Prob. 37PPCh. 10.3 - Prob. 38PPCh. 10.3 - Prob. 39PPCh. 10.3 - Prob. 40PPCh. 10.3 - Prob. 41PPCh. 10.3 - Prob. 42PPCh. 10.3 - Prob. 43PPCh. 10.3 - Prob. 44PPCh. 10.3 - Prob. 45PPCh. 10.3 - Prob. 46PPCh. 10.3 - Prob. 47SSCCh. 10.3 - Prob. 48SSCCh. 10.3 - Prob. 49SSCCh. 10.3 - Prob. 50SSCCh. 10.3 - Prob. 51SSCCh. 10.3 - Prob. 52SSCCh. 10.3 - Prob. 53SSCCh. 10.4 - Prob. 54PPCh. 10.4 - Prob. 55PPCh. 10.4 - Prob. 56PPCh. 10.4 - Prob. 57PPCh. 10.4 - Prob. 58PPCh. 10.4 - Prob. 59PPCh. 10.4 - Prob. 60PPCh. 10.4 - Prob. 61PPCh. 10.4 - Prob. 62PPCh. 10.4 - Prob. 63PPCh. 10.4 - Prob. 64PPCh. 10.4 - Prob. 65PPCh. 10.4 - Prob. 66PPCh. 10.4 - Prob. 67SSCCh. 10.4 - Prob. 68SSCCh. 10.4 - Prob. 69SSCCh. 10.4 - Prob. 70SSCCh. 10.4 - Prob. 71SSCCh. 10.4 - Prob. 72SSCCh. 10.4 - Prob. 73SSCCh. 10.5 - Prob. 74PPCh. 10.5 - Prob. 75PPCh. 10.5 - Prob. 76SSCCh. 10.5 - Prob. 77SSCCh. 10.5 - Prob. 78SSCCh. 10.5 - Prob. 79SSCCh. 10.5 - Prob. 80SSCCh. 10.5 - Prob. 81SSCCh. 10.5 - Prob. 82SSCCh. 10 - Prob. 83ACh. 10 - Prob. 84ACh. 10 - Prob. 85ACh. 10 - Prob. 86ACh. 10 - Prob. 87ACh. 10 - Prob. 88ACh. 10 - Prob. 89ACh. 10 - Determine the number of representative particles...Ch. 10 - Determine the number of representative particles...Ch. 10 - Prob. 92ACh. 10 - Determine the number of moles in each substance....Ch. 10 - Prob. 94ACh. 10 - Prob. 95ACh. 10 - RDA of Selenium The recommended daily allowance...Ch. 10 - Prob. 97ACh. 10 - Prob. 98ACh. 10 - Prob. 99ACh. 10 - Prob. 100ACh. 10 - Prob. 101ACh. 10 - Prob. 102ACh. 10 - Prob. 103ACh. 10 - Prob. 104ACh. 10 - Prob. 105ACh. 10 - Prob. 106ACh. 10 - Prob. 107ACh. 10 - Calculate the mass of each element. a. 5.22 mol of...Ch. 10 - Perform the following conversions. a. 3.50 mol of...Ch. 10 - Determine the mass in grams of each element....Ch. 10 - Complete Table 10.3.Ch. 10 - Convert each to mass in grams. a. 4.221015 atoms c...Ch. 10 - Prob. 113ACh. 10 - Prob. 114ACh. 10 - Prob. 115ACh. 10 - Prob. 116ACh. 10 - Prob. 117ACh. 10 - Prob. 118ACh. 10 - Prob. 119ACh. 10 - Prob. 120ACh. 10 - Prob. 121ACh. 10 - Prob. 122ACh. 10 - Prob. 123ACh. 10 - Prob. 124ACh. 10 - Prob. 125ACh. 10 - Prob. 126ACh. 10 - Prob. 127ACh. 10 - Prob. 128ACh. 10 - Prob. 129ACh. 10 - Prob. 130ACh. 10 - Prob. 131ACh. 10 - Prob. 132ACh. 10 - Prob. 133ACh. 10 - Prob. 134ACh. 10 - Prob. 135ACh. 10 - Prob. 136ACh. 10 - Prob. 137ACh. 10 - Prob. 138ACh. 10 - Prob. 139ACh. 10 - Prob. 140ACh. 10 - Prob. 141ACh. 10 - Prob. 142ACh. 10 - Prob. 143ACh. 10 - Prob. 144ACh. 10 - Prob. 145ACh. 10 - Prob. 146ACh. 10 - Prob. 147ACh. 10 - Pain Relief Acetaminophen, a common aspirin...Ch. 10 - Prob. 149ACh. 10 - Prob. 150ACh. 10 - Prob. 151ACh. 10 - Prob. 152ACh. 10 - Prob. 153ACh. 10 - Prob. 154ACh. 10 - Prob. 155ACh. 10 - Prob. 156ACh. 10 - Prob. 157ACh. 10 - Prob. 158ACh. 10 - Prob. 159ACh. 10 - Prob. 160ACh. 10 - Prob. 161ACh. 10 - Prob. 162ACh. 10 - Express the composition of each compound as the...Ch. 10 - VitaminD3 Your body's ability to absorb calcium is...Ch. 10 - Prob. 165ACh. 10 - Cholesterol Heart disease is linked to high blood...Ch. 10 - Prob. 167ACh. 10 - Prob. 168ACh. 10 - Prob. 169ACh. 10 - Prob. 170ACh. 10 - Prob. 171ACh. 10 - Prob. 172ACh. 10 - Prob. 173ACh. 10 - Prob. 174ACh. 10 - Prob. 175ACh. 10 - Prob. 176ACh. 10 - Prob. 177ACh. 10 - Prob. 178ACh. 10 - Prob. 179ACh. 10 - Determine the mass percent of anhydrous sodium...Ch. 10 - Table 4 shows data from an experiment to determine...Ch. 10 - Chromium(lll) nitrate forms a hydrate that is...Ch. 10 - Determine the percent composition of MgCO35H2O and...Ch. 10 - What is the formula and name of a hydrate that is...Ch. 10 - Gypsum is hydrated calcium sulfate. A 4.89-g...Ch. 10 - A 1.628-g sample of a hydrate of magnesium iodide...Ch. 10 - Borax Hydrated sodiumtetraborate (Na2B4O7xH2O) is...Ch. 10 - Prob. 188ACh. 10 - Prob. 189ACh. 10 - Prob. 190ACh. 10 - Prob. 191ACh. 10 - Prob. 192ACh. 10 - Prob. 193ACh. 10 - Prob. 194ACh. 10 - Prob. 195ACh. 10 - Prob. 196ACh. 10 - Prob. 197ACh. 10 - Prob. 198ACh. 10 - Prob. 199ACh. 10 - Prob. 200ACh. 10 - Prob. 201ACh. 10 - Prob. 202ACh. 10 - Prob. 203ACh. 10 - Prob. 204ACh. 10 - Prob. 205ACh. 10 - Prob. 206ACh. 10 - Prob. 207ACh. 10 - Prob. 208ACh. 10 - Prob. 209ACh. 10 - Prob. 210ACh. 10 - Prob. 211ACh. 10 - Prob. 212ACh. 10 - Prob. 213ACh. 10 - Prob. 214ACh. 10 - Prob. 215ACh. 10 - Prob. 216ACh. 10 - Prob. 1STPCh. 10 - Prob. 2STPCh. 10 - Prob. 3STPCh. 10 - Prob. 4STPCh. 10 - Prob. 5STPCh. 10 - Prob. 6STPCh. 10 - Prob. 7STPCh. 10 - Prob. 8STPCh. 10 - Prob. 9STPCh. 10 - Prob. 10STPCh. 10 - Prob. 11STPCh. 10 - Prob. 12STPCh. 10 - Prob. 13STPCh. 10 - Prob. 14STPCh. 10 - Prob. 15STPCh. 10 - Prob. 16STP
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