Tue April 01, 2014 By: Akash Bhardwaj

what is molar mass ?tell me in brief

Expert Reply
Tue April 01, 2014

In chemistry, the molar mass M is a physical property. It is defined as the mass of a given substance (chemical element or chemical compound) divided by its amount of substance.  The base SI unit for molar mass is kg/mol. However, for historical reasons, molar masses are almost always expressed in g/mol.

As an example, the molar mass of water is approximately: M(H2O) ≈ 18 gmol−1

Molecular mass of hydrogen atom is 1

Molecular mass of oxygen atom is 16

Therefore, H + H + O = 1 + 1 + 16 = 18

Sometimes scientists use molecular mass as a synonym for molar mass.

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