Chapter 10.1, Problem 11SSC

Interpretation Introduction

Interpretation: The calculation of the number of particles in the given moles of a substance needs to be determined.

Concept Introduction: In 1 mole of any substance, there are $6.022\times {10}^{23}$ units of that substance. These units can be atoms and molecules. The number of units in 1 mole of any substance is known as Avogadro’s number. It is denoted by the symbol N_A .

Explanation of Solution

The unit of measurement for the amount of substance is known as mole. It helps in determining the atoms and mass of the material. It helps chemists to determine the amount of two substances like Copper and iron such that one can obtain an equal amount of both.

There are $6.022\times {10}^{23}$ units in 1 mole of a substance. The representative particles depend on the type of substance. For example, for a compound, the representative particles are molecules and it is atoms in the case of elements.

Thus, the number of particles in the given moles of substance can be calculated as follows:

  $N=n{\text{N}}_{\text{A}}$

Here, N_A is Avogadro’s number and the value is equal to $6.022\times {10}^{23}$ .

Conclusion

Thus, the number of particles can be calculated from the number of moles using Avogadro’s number.