   Chapter 2.7, Problem 2.11CYU

Chapter
Section
Textbook Problem

Hydrated nickel(II) chloride is a beautiful green, crystalline compound. When heated strongly, the compound is dehydrated. If 0.235 g of NiCl2 xH2o gives 0.128 g of NiCl2 on heating, what is the value of x

Interpretation Introduction

Interpretation:

The value of x or the number of water molecules per formula of NiCl2.xH2O has to be calculated from the given data’s.

Concept introduction:

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

Numberofmoles=MassingramsMolarmass

• Molar mass of a molecule can be calculated from its molecular formula by taking the sum of atomic masses of all the elements present in it.
Explanation

Given,

The mass of hydrated sample (NiCl2.xH2O) is 0.235g.

The mass of dehydrated sample NiCl2 is 0.128g.

Therefore,

The mass of water molecules in the sample is 0.235g0.128g=0.107g

Equation for finding number moles from mass of a molecule and molar mass is,

Numberofmoles=MassingramsMolarmass

Therefore,

The number of moles of water molecule is,

Numberofmoles=0.107g18g=0

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