Question

How can the periodic table be used to determine the molar mass?

Answer 1

Hint: Molar mass is nothing but the mass of the sample divided by the amount of the particular given substance and it is measured in moles. Molar mass is a property of a substance and it is bulk and not molecular.

Complete answer:
- In the question it is given how a periodic table is useful to determine the molar mass of the compound.
- We know that a compound consists of more than one element in its composition.
- The molecular weight of the substance is the sum of the atomic weights of all the elements which are present in the substance.
- We will get the atomic weight of the elements from the periodic table only.
- After doing the sum of the atomic weight of the elements we have to divide the molecular weight of the total substance with weight of the substance to get the molar mass of the compound.
 - So, we have to take the atomic weights of the elements from the periodic table only.
- This is how the periodic table is going to help to determine the molar mass of the substances.

Note:
In the periodic table all the elements are arranged according to their atomic numbers, chemical properties and electronic configuration. From the data of the number of protons and the number of electrons present in the element we will get the atomic mass of the element. By doing the sum of the atomic masses we will get the molecular weight of the substance.