Chapter F, Problem E.2AST

(a)

Interpretation Introduction

Interpretation:

Moles of copper atom that is present in $\text{3}\text{.20}\text{g}$ of copper coin has to be calculated.

Concept Introduction:

Mole of a substance is defined as the substance that contains the same number of substance as there are the number of atoms present in $\text{12}\text{g}$ of carbon-12 isotope.

Mass of a sample is defined as the amount of sample in moles that is multiplied by molar mass of the sample.

    $\begin{array}{c}\text{Mass of sample}=\text{amount}\text{in}\text{moles}\times \text{Molar mass}\\ m=nM\end{array}$

Where,

    $n$ is the amount in moles.

(b)

Interpretation Introduction

Interpretation:

Number of copper atom present in $\text{3}\text{.20}\text{g}$ of copper coin has to be calculated.

Concept Introduction:

Mole of a substance is defined as the substance that contains the same number of substance as there are the number of atoms present in $\text{12}\text{g}$ of carbon-12 isotope.  One mole of any substance contains Avogadro’s number of substance.

    $\begin{array}{c}\text{Number}\text{of}\text{objects}=\text{amount}\text{in}\text{moles}\times \text{Avogadro's}\text{constant}\\ N=n{N}_A\end{array}$

Where,

    $n$ is the amount in moles.