Molecular Mass Quiz

The molecular mass of a substance is obtained by multiplying the average atomic mass of each element by the number of its atoms and adding them together.

The molecular mass of carbon dioxide (CO2) is calculated as 1(average atomic mass of C) + 2 (average atomic mass of O) = 1 (12.0 u) + 2 (16.0 u) = 44.0 u.

Molecular mass of a substance is the sum of average atomic masses of all the atoms of elements which constitute the molecule.

The molecular mass of water (H2O) is calculated as 2 × 1 u + 16 u = 18 u.

The molecular mass of benzene (C6H6) is calculated as (6 × 12 u) + (6 × 1 u) = 78 u.

Mass is the measure of the quantity of matter a body contains and is an inherent property of matter. Weight is the result of the mass and gravitational attraction. The weight of a body varies because the gravitational attraction of the earth for a body varies with the distance from the centre of the earth.

Mass is considered a more fundamental property than weight because the mass of a body does not vary as its position changes, while the weight of a body varies with the distance from the centre of the earth due to gravitational attraction.

The basic unit of mass in the SI system is the kilogram.

The fractional quantity used for weighing small quantities of chemicals in laboratories is 'gram'.

In chemistry, we come across the term 'length' while expressing properties such as the atomic radius, bond length, wavelength of electromagnetic radiation, and so on.