Question

Find the molar mass of the calcium carbonate by calculation.

Answer 1

Hint: The molar mass of any compound can be calculated by adding the atomic weight of the individual atoms involved in the chemical formula of the respective chemical compound. We should know the molecular or chemical formula of the respective compound.

Complete answer:
- In the question it is asked to calculate the molar mass of the calcium carbonate.
- We should know the chemical formula of the calcium carbonate to calculate the molar mass of it.
- The chemical formula of the calcium carbonate is $CaC{{O}_{3}}$.
- We should know the atomic weights of the calcium, carbon and the oxygen to calculate the molar mass of the calcium carbonate.
- The atomic weight of the calcium is 40, the atomic weight of the carbon is 12, and the atomic weight of the oxygen is 16.
- Now we can calculate the molar mass or molecular weight of the calcium carbonate by using the below formula.
Molecular weight of the $CaC{{O}_{3}}$ = Atomic weight of the Ca + Atomic weight of the C + 3
(atomic weight of the oxygen)
Molecular weight of the $CaC{{O}_{3}}$ = 40 + 12 + 3 (16) = 100.
- Now we must express the molecular weight of the calcium carbonate in molar mass.
- The molar mass of the calcium carbonate is 100 g/mol.

Note:
Without knowing the chemical or molecular formula of the compound and without knowing the atomic weights of the individual elements involved in the chemical formula it is very difficult to calculate the molar mass of the respective compound.