   # DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction: In a government lab, 1142 g of chlorobenzene is reacted with 485 g of chloral. a. What mass of DDT is formed, assuming 100% yield? b. Which reactant is limiting? Which is in excess? c. What mass of the excess reactant is left over? d. If the actual yield of DDT is 200.0 g, what is the percent yield? ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 5, Problem 124E
Textbook Problem
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## DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction: In a government lab, 1142 g of chlorobenzene is reacted with 485 g of chloral.a. What mass of DDT is formed, assuming 100% yield?b. Which reactant is limiting? Which is in excess?c. What mass of the excess reactant is left over?d. If the actual yield of DDT is 200.0 g, what is the percent yield?

(a)

Interpretation Introduction

Concept introduction: The mass of a substance can be obtained by using the number of moles of the substance present and its molar mass. The formula used to calculate the mass of a given substance is,

Massofthesubstance=(Numberofmoles)×(Molarmassofthesubstance)

To determine: The mass of DDT formed in the given reaction.

### Explanation of Solution

Given

The balanced chemical equation is,

2C6H5Cl+C2HOCl3C14H9Cl5+H2O

The given mass of C6H5Cl is 1142g .

The given mass of C2HOCl3 is 485g .

The molar mass of C6H5Cl =6C+5H+Cl=((6×12)+(5×1)+35.5)g/mol=112.5g/mol

The molar mass of C2HOCl3 =2C+H+O+3Cl=((2×12)+1+16+(3×35.5))g/mol=147.5g/mol

Formula

The number of moles of a substance is calculated by the formula,

Numberofmoles=GivenmassofthesubstanceMolarmassofthesubstance

Substitute the value of the given mass and the molar mass of C6H5Cl and C2HOCl3 in the above expression.

NumberofmolesofC6H5Cl=1142g112.5g/mol=10.15mol

NumberofmolesofC2HOCl3=485g147.5g/mol=3.29mol

According to the stated reaction,

2mol of C6H5Cl react with 1mol of C2HOCl3 .

1mol of C6H5Cl reacts with C2HOCl3 =(12)mol

10

(b)

Interpretation Introduction

Concept introduction: The mass of a substance can be obtained by using the number of moles of the substance present and its molar mass. The formula used to calculate the mass of a given substance is,

Massofthesubstance=(Numberofmoles)×(Molarmassofthesubstance)

To determine: The limiting and the excess reactant.

(c)

Interpretation Introduction

Concept introduction: The mass of a substance can be obtained by using the number of moles of the substance present and its molar mass. The formula used to calculate the mass of a given substance is,

Massofthesubstance=(Numberofmoles)×(Molarmassofthesubstance)

To determine: The mass of the excess reactant left over.

(d)

Interpretation Introduction

Concept introduction: The mass of a substance can be obtained by using the number of moles of the substance present and its molar mass. The formula used to calculate the mass of a given substance is,

Massofthesubstance=(Numberofmoles)×(Molarmassofthesubstance)

To determine: The percent yield of DDT (C14H9Cl5) .

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