gram-molecular weight


Also found in: Dictionary, Thesaurus, Medical.

gram-molecular weight,

amount of a molecular substance whose weight, in grams, is numerically equal to the molecular weightmolecular weight,
weight of a molecule of a substance expressed in atomic mass units (amu). The molecular weight may be calculated from the molecular formula of the substance; it is the sum of the atomic weights of the atoms making up the molecule.
..... Click the link for more information.
 of that substance. For example, one gram-molecular weight of molecular oxygen, O2 (molecular weight approximately 32), is 32 grams, and one gram-molecular weight of water, H2O (molecular weight approximately 18) is 18 grams. The term molemole,
in chemistry, a quantity of particles of any type equal to Avogadro's number, or 6.02×1023 particles. One gram-molecular weight of any molecular substance contains exactly one mole of molecules.
..... Click the link for more information.
 is often used in place of gram-molecular weight. See gram-atomic weightgram-atomic weight,
amount of an atomic substance whose weight, in grams, is numerically equal to the atomic weight of that substance. For example, 1 gram-atomic weight of atomic oxygen, O (atomic weight approximately 16), is 16 grams. See gram-molecular weight.
..... Click the link for more information.
.

gram-molecular weight

[¦gram mə¦lek·yə·lər ′wāt]
(chemistry)
The molecular weight of compound expressed in grams, that is, the molecular weight on a scale on which the atomic weight of carbon-12 isotope is taken as 12 exactly.