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Chemistry & Chemical Reactivity

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

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BuyFindarrow_forward

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 women’s is given that 18mg.

The molar mass of iron is 55.845g.

Conversion formula for mass of a molecule into number moles,

    Numberofmoles=MassingramsMolarmass 

Therefore,

The number moles of iron is,

    Numberofmoles=18×103g55.845g/mol=3

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