   Chapter 2, Problem 118GQ

Chapter
Section
Textbook Problem

Which of the following samples has the largest number of ions?(a) 1.0 g of BeCl2(b) 1.0 g of MgCl2(c) 1.0 g of CaS(d) l.0 g of SrCO3(e) 1.0 g of BaSO4

Interpretation Introduction

Interpretation:

The largest number of ions containing samples from the given samples is to be identified.

Concept introduction:

Molar masses of BeCl2,MgCl2, CaS, SrCO3 and BaSO4 are 79.9g, 95.2g, 72.1g, 147.6g, and 233.4g  respectively.

Ionic compound is composed of positive ions (cations) and negative ions (anions).

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

Numberofmoles=MassingramsMolarmass

Explanation

Reason for correct option:

Each of the given compounds is in one gram amount.

Conversion formula for mass of an atom into number moles,

Numberofmoles=MassingramsMolarmass

Therefore,

(a)

The number of moles of BeCl2 is,

Numberofmoles=1g79.9g/mol=0.0125mol

So, there are 0.0125mol cations as well anions in the BeCl2.

(b)

The number of moles of MgCl2 is,

Numberofmoles=1g95.2g/mol=0.0105mol

So, there are 0.0105mol cations as well anions in the MgCl2.

(c)

The number of moles of CaS is,

Numberofmoles=1g72

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