Chapter U4.9, Problem 1TAI

Interpretation Introduction

Interpretation:

The relationship between mass and moles must be explained.

Concept introduction:

Both mass and mole represents quantity of a substance.

Mole is the amount of any substance in which Avogadro number of entities are there such as atoms, molecules, ions, etc.

Answer to Problem 1TAI

Mass and mole are proportional to each other.

Explanation of Solution

If given mass of a substance is increased, then mole will also increase.

For example, 1 mole H₂SO₄ is 98 g. If 10 moles of H₂SO₄ is taken, then it will be 980 g.

Mole is the general unit for chemicals which can be used to compare the number of atoms, molecules, etc. as present in different samples.

For examples atoms in 12 g of C is $6.023\times {10}^{23}$ or 1 mol wheraes atoms in 12 g Mg is $3.0115\times {10}^{23}$ that is 0.5 mol.

Thus, mass of two substances might be same but moles will be different. Accordingly, the number of atoms, molecules, etc. will be also different.