Chapter 2, Problem 1CP

For a substance, what is the difference between mass and molar mass? How are these two related?

To determine

The difference between the mass and molar mass of the substance.

The relation between the mass and molar mass.

Answer to Problem 1CP

The difference between the mass and molar mass of the substance is shown in the table (1).

Explanation of Solution

Table (1) shows the difference between the pound mass and pound force.

Mass	Molar mass
The amount of matter present in the substance is defined as mass and molecular mass is the mass of one molecule of the substance.	Molar mass is the property of the substance which is defined as the ratio of the mass of the substance and the amount of substance.
Unit of the mass is $\text{kg}$ .	Unit of molar mass is $\text{kg}/\text{mol}$ .
Mass is represented by the symbol $m$ .	Molar mass is represented by the symbol $M$ .

Table (1)

Write the expression for the number of moles of the substance.

  $n=\frac{m}{M}$

Here the mass of the substance is $m$ and the molar mass is $M$.

Number of moles relates the mass and molar mass; the ratio of mass and the molar mass is defined as number of moles present in that particular substance.