Chapter 10, Problem 106A

Interpretation Introduction

Interpretation:

The relationship between mole, molar mass and Avogadro's number should be discussed.

Concept introduction:

Mole is SI unit which is used to measure the quantity of the substance. It is the quantity of a substance which contains same number of atoms as present in accurately 12.00 g of carbon-12 is known as mole.

Explanation of Solution

Since, one mole of any substance is equal to the Avogadro number i.e. $6.022\times {10}^{23}$ atoms.

Thus, the relationship between number of moles and Avogadro's number is expressed as:

Number of moles = $\text{number of molecules ×}\frac{1\text{ mole}}{6.022\times 10\text{molecules}}$

The relationship between molar mass and number of moles is expressed as:

Number of moles = $\frac{\text{given mass of the compound}}{\text{molar mass of the compound}}$

Mass in grams of one mole of a substance is known as molar mass. The number of atoms/molecules present in one mole is known as Avogadro number. Thus, mass of $6.022\times {10}^{23}$ atoms is equal to the molar mass of substance.