Chapter 3, Problem 6QAP

Interpretation Introduction

(a)

Interpretation:

The number of moles of platinum in the cone should be calculated.

Concept introduction:

The number of moles of a substance is related to molar mass of the substance as follows:

$n=\frac{m}{M}$

Here, m is mass and M is molar mass.

In 1 mol of a substance there are $6.023\times {10}^{23}$ units of that substance.

Also, density of a substance is related to mass and volume as follows:

$d=\frac{m}{V}$

Here, m is mass and V is volume of the substance.

Interpretation Introduction

(b)

Interpretation:

The number of electrons in there in the cone should be calculated.

Concept introduction:

The number of moles of a substance is related to molar mass of the substance as follows:

$n=\frac{m}{M}$

Here, m is mass and M is molar mass.

According to Avogadro’s law, in 1 mol of a substance there are $6.023\times {10}^{23}$ units of that substance.