Exploring Chemical Analysis
Exploring Chemical Analysis
5th Edition
ISBN: 9781429275033
Author: Daniel C. Harris
Publisher: Macmillan Higher Education
Question
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Chapter 7, Problem 7.2P
Interpretation Introduction

Interpretation:

The number of ethoxyl groups present in the sample compound has to be calculated.

Expert Solution & Answer
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Explanation of Solution

Given,

    25.42mg of sample.

    29.03mg of silver iodide.

Let n be the number of CH3CH2O- groups in the sample compound

    R(OCH2CH3)n + nHI  R(OH)n + nCH3CH2ICH3CH2I + Ag + H2 AgI + CH3CH2OHMoles of CH3CH2I = moles of AgI=0.02903g234.77g/mol=1.24×10-4molMolesofsample=0.02542g417g/mol=6.10×10-5molNumberofethoxylgrouppermolecule=Moles of CH3CH2Molesofsample=1.24×10-4mol6.10×10-5mol =2.03

Therefore, two ethoxyl groups are present in the compound.

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