Question

What is the molar mass of the potassium permanganate?

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 potassium permanganate.
- We should know the chemical formula of the potassium permanganate to calculate the molar mass of it.
- The chemical formula of the potassium permanganate is $KMn{{O}_{4}}$.
- We should know the atomic weights of the potassium, manganese and the oxygen to calculate the molar mass of the potassium permanganate.
- The atomic weight of the potassium is 19, the atomic weight of the manganese is 55, and the atomic weight of the oxygen is 16.
- Now we can calculate the molar mass or molecular weight of the potassium permanganate by using the below formula.
Molecular weight of the $KMn{{O}_{4}}$ = Atomic weight of the K + Atomic weight of the Mn + 4 (atomic weight of the oxygen)
Molecular weight of the $KMn{{O}_{4}}$ = 19 + 55 + 4 (16) = 158.
- Now we must express the molecular weight of the potassium permanganate in molar mass.
- The molar mass of the potassium permanganate is 158 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.