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Dictionary

mol•e•cule

Pronunciation: (mol'u-kyOOl"), [key]
—n.
1. Chem., Physics.the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound.
2. Chem.a quantity of a substance, the weight of which, measured in any chosen unit, is numerically equal to the molecular weight; gram molecule.
3. any very small particle.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

molecular weight

mole fraction

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