molecular weight noun
: the average mass of a molecule of a compound compared to 1⁄12 the mass of carbon 12 and calculated as the sum of the atomic weights of the constituent atoms
First Known Use of MOLECULAR WEIGHT
molecular weight noun (Medical Dictionary)
: the mass of a molecule that may be calculated as the sum of the atomic weights of its constituent atoms
molecular weight noun (Concise Encyclopedia)
Mass of a molecule of a substance, based on 12 as the atomic weight of carbon-12. It is calculated in practice by summing the atomic weights of the atoms making up the substance's molecular formula. The molecular weight of a hydrogen molecule (chemical formula H) is 2 (after rounding off); for many complex organic molecules (e.g., proteins, polymers) it may be in the millions.
Variants of MOLECULAR WEIGHT
molecular weight also called molecular mass
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