(a) Interpretation: Mass absorption coefficient of a solution containing 11.00 g of KI and 89.00 g of water should be calculated. Concept introduction: Mass absorption coefficient ( μ M ) is the absorption cross section per unit mass (units are cm 2 /g) . Mass absorption coefficient is independent of chemical and physical nature of elements. Mass absorption coefficient ( μ M ) of a sample can be calculated by adding the contributions of the mass absorption coefficients of each element present in the sample. Contribution of “element A” to the mass absorption coefficient of a sample can be written as W A μ A Where, W A = weight fraction of the element A and μ A = mass absorption coefficient of the element Therefore, the mass absorption coefficient ( μ M ) of a sample can be written as, μ M = W A μ A + W B μ B + W C μ C + ... In order to calculate mass fractions of each element in a sample, the atomic mass of each element and the molar mass of each compound should be known. Weight fraction ( W A ) = atomic mass of the element molar mass of the compound × weight of the compound × 1 weight of the sample Atomic/molar masses of K =39 .10 g/mol I =126 .90 g/mol K =39 .10 g/mol H =1 .01 g/mol O =16 .0 g/mol KI =166 .0 g/mol H 2 O =18 .02 g/mol

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

Solutions

Chapter 12, Problem 12.6QAP
Interpretation Introduction

(a)Interpretation:Mass absorption coefficient of a solution containing 11.00 g of KI and 89.00 g of water should be calculated.Concept introduction:Mass absorption coefficient ( μM ) is the absorption cross section per unit mass (units are cm2/g). Mass absorption coefficient is independent of chemical and physical nature of elements.Mass absorption coefficient ( μM ) of a sample can be calculated by adding the contributions of the mass absorption coefficients of each element present in the sample.Contribution of “element A” to the mass absorption coefficient of a sample can be written as WAμAWhere, WA= weight fraction of the element A and μA=mass absorption coefficient of the elementTherefore, the mass absorption coefficient ( μM ) of a sample can be written as,μM=WAμA+WBμB+WCμC+...In order to calculate mass fractions of each element in a sample, the atomic mass of each element and the molar mass of each compound should be known.Weight fraction (WA) = atomic mass of the elementmolar mass of the compound × weight of the compound×1weight of the sampleAtomic/molar masses of K =39.10 g/molI   =126.90 g/molK  =39.10 g/molH  =1.01 g/molO  =16.0 g/molKI =166.0 g/molH2O  =18.02 g/mol

Interpretation Introduction

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