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 11, Problem 94A
Interpretation Introduction

Interpretation:

Percent yield of Zr to be determined

Concept introduction:

Zirconium is produced and purified by using Van Arkel process.

In first step impure Zr is heated with Iodine to form ZrI4. In second step ZrI4 decomposes to pure Zr.

Expert Solution & Answer
Check Mark

Answer to Problem 94A

Theoretical yield of Zr is 6.85 g

Percent yield is 72.99%

Explanation of Solution

Step 1: write balance chemical equation

ZrI4(s)Zr(s)+2I2(g)45g5g

Step 2: convert mass of reactant to moles

MolarmassofZrI4=598.83g/moleMoles=MassMolarmassMolesofZrI4=45598.83=0.075moles

Step 3: Convert moles of reactant to moles of product using mole ratio

1 mole of ZrI4 produce = 1 moles of Zr

0.075 moles of ZrI4 produce = 0.075 moles of Zr

Step 4: Convert moles of product to mass (theoretical yield)

MolarmassofZr=91.22g/moleMass=Molarmass×MolesMassofZr(Theoreticalyield)=91.22×0.075=6.85g

Actual yield = 5 g (given)

PercentYield=ActualyieldTheoreticalyield×100=56.85×100=72.99%

Chapter 11 Solutions

Chemistry: Matter and Change

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