Chapter 3.1, Problem 3.2BFP

Interpretation Introduction

Interpretation:

The number of helium atoms in a tank are to be calculated. The road map for the calculation of the helium atoms is to be included.

Concept introduction:

The SI unit for amount of substance is $\text{mol}$. One mole is defined as the amount of substance that contains the same number of entities such as molecules, ions, atoms as the number of atoms in $12\text{ g}$ of $\text{C-12}$. This number is called Avogadro’s number. The value of Avogadro’s number is $\text{6}\text{.022}\times {\text{10}}^{23}\left(\text{entitites/mol}\right)$.

The number of an atom of a substance can be calculated from the given amount of substance and the Avogadro’ number.

The expression to calculate the number of atoms of an element is as follows:

$\text{Number of atoms}=\left(\begin{array}{l}\text{amount of}\\ \text{element }\left(\text{mol}\right)\end{array}\right)\left(\frac{6.022\times {10}^{23}\text{ atoms}}{1\text{ mol}}\right)$