In chemistry, the molar mass 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 g·mol−1
Read more about Molar Mass: Molar Masses of Elements, Molar Masses of Compounds, Average Molar Mass of Mixtures, Related Quantities, Precision and Uncertainties, Measurement
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