Chapter 16, Problem 16.36P

(a)

Interpretation Introduction

Interpretation:

Amount of ${\text{Co}}^{3+}$ present in $\text{25}\text{.00 mg}$ of the material has to be explained.

(b)

Interpretation Introduction

Interpretation:

Average oxidation state of Cobalt has to be determined.

Concept introduction:

Oxidation number: Oxidation number is defined as degree of oxidation (ie. loss of an electrons) of an atom within the chemical compound.

There is slightly difference between oxidation state and oxidation number.  In oxidation state, there is electronegativity of an atom in a bond should be considered.  However, when describing oxidation number, electronegativity does not considered.

(c)

Interpretation Introduction

Interpretation:

The value of y in the formula of ${\text{Li}}_{\text{1+y}}{\text{CoO}}_{\text{2}}$ has to be found.

(d)

Interpretation Introduction

Interpretation:

Theoretical quotient weight percentage of Li in weight percentage of Co has to be calculated and observed quotient dependable with the average oxidation state of Cobalt has to be explained.

Concept introduction:

The mass percentage or weight percentage of compound can be calculated by taking the calculated mass of the substance to the total mass of the sample whole multiplied by 100.

The mass percent can be calculated with formula,

$Masspercent(inpercentage)=\frac{Calculatedmass(ingrams)}{totalmass(ingrams)}\times 100$