   Chapter 2, Problem 67PS

Chapter
Section
Textbook Problem

Analysis of a 10.0-g sample of apatite (a major component of tooth enamel) showed that it was made up of 3.99 g Ca, 1.85 g P, 4.14 g O, and 0.020 g H. List these elements based on relative amounts (moles), from smallest to largest.

Interpretation Introduction

Interpretation:

The components of given sample of apatite are needed to be arranged in the order of smallest to largest in numbers of moles containing elements.

Concept introduction:

Molar masses of Ca, P, O and H are 40g, 30.9g, 15.9g, and 1g respectively.

• Conversion formula for mass of an atom into number moles,

Numberofmoles=MassingramsMolarmass

Explanation

Conversion formula for mass of an atom into number moles,

Numberofmoles=MassingramsMolarmass

The masses of elements in the sample are different. Masses of Ca, P, O and H in sample are 3.99g, 1.85g, 4.14g, and 0.02g respectively.

Therefore,

The number of moles calcium is,

Numberofmoles=3.9940=0.0996mol

The number of moles phosphorous is,

Numberofmoles=1

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