Chapter 2.7, Problem 2.11CYU

### 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

# 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.xâ€‰H2O) is 0.235g.

The mass of dehydrated sample NiCl2 is 0.128g.

Therefore,

The mass of water molecules in the sample is 0.235gâˆ’0.128g=â€‰0.107gÂ

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

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

Therefore,

The number of moles of water molecule is,

Â Â Â Â Numberâ€‰ofâ€‰molesâ€‰â€‰=â€‰â€‰0.107gâ€‰18gâ€‰â€‰=â€‰â€‰0

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