   Chapter 3, Problem 140AE

Chapter
Section
Textbook Problem

In the spring of 1984, concern arose over the presence of ethylene dibromide, or EDB, in grains and cereals. EDB has the molecular formula C2H4Br2 and until 1984 was commonly used as a plant fumigant. The federal limit for EDB in finished cereal products is 30.0 parts per billion (ppb), where 1.0 ppb = 1.0 × 10−9 g of EDB for every 1.0 g of sample. How many molecules of EDB are in 1.0 lb of flour if 30.0 ppb of EDB is present?

Interpretation Introduction

Interpretation:

The number of Ethylene dibromide (EDB) molecule present in 30.0 ppb of 1.0 lb of flour containing EDB should be calculated.

Concept introduction:

The gram molar mass of compound contains one mole of compound.

One mole of atom contains 6.023×1023 number of atoms is known as Avogadro number.

Mole:

The ratio between mass of the sample taken and molar mass of compound to give a mole of the analyte present in taken gram of sample.

Mole=MassMolarmass

Explanation

The number of Ethylene dibromide (EDB) molecule present in 30.0 ppb of 1.0 lb of flour containing EDB.

The conversion of pound mass of EDB into gram is,

1.0lbs=453.592g

Molar mass of EDB is  415.09g

Mole of EDB present in 30.0 ppb of 1.0 lb of flour is,

=453.592gflour×30.01×109×1moleEDB187.86g=7.24×108mole

The gram mass and molar mass of EDB are plugged in above equation to give mole of EDB Mole of EDB present in 30

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