Chapter 2, Problem 110GQ

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# The recommended daily allowance (RDA) of iron for women 19-30 years old is 18 mg. How many moles is this? How many atoms?

Interpretation Introduction

Interpretation:

The number of moles and the number of atoms for the given amount of iron intake of women are needed to be calculated.

Concept introduction:

• Conversion formula for mass of a molecule into number moles,

Numberofmoles=MassingramsMolarmass

• Equation for finding number of molecules from number of moles of a molecule,

Numberofmolecule=numberofmolesofmolecule×6.022×1023molecules/mol

Explanation

The amount of iron intake for womenâ€™s is given that 18mg.

The molar mass of iron is 55.845g.

Conversion formula for mass of a molecule into number moles,

Â Â Â Â Numberâ€‰ofâ€‰molesâ€‰â€‰=â€‰â€‰Massâ€‰inâ€‰gramsâ€‰Molarâ€‰massÂ

Therefore,

The number moles of iron is,

Â Â Â Â Numberâ€‰ofâ€‰molesâ€‰â€‰=â€‰â€‰18â€‰Ã—10âˆ’3gâ€‰55.845g/molâ€‰â€‰=â€‰â€‰3

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