Molecular Weight

Definition - What does Molecular Weight mean?

Molecular Weight is the mass of one mole of a substance. It is the total weight in the atomic mass unit of an atom in a formula. Through the Molecular Weight, the grams in one mole of a substance can be found out. The molecular formula applied on molar mass results in the Molecular Weight. When the Molecular Weight for a chemical compound is calculated, we can calculate the number of grams present in one mole of that substance. Every substance has a Molecular Weight, even water. Molecular Weight is also known as molecular mass.

Petropedia explains Molecular Weight

A molecule's mass or weight is called Molecular Weight. Before calculating the Molecular Weight of a substance, it is important to know the number of atoms of each element that is present in a substance. Also, the atomic weight of each element is important to be considered before the calculation of the Molecular Weight of a substance. The Molecular Weight or molecular mass of a substance can be calculated by multiplying the atomic weight of each element by the number of atoms present in the formula. The Molecular Weight of a substance can be determined by three methods – hydrodynamics method, mass spectrometry and static light scattering.

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