molar volume, the volume occupied by a mole of a substance at STP. According to Avogadro's law, at a given temperature and pressure a given volume of any gas contains the same number of molecules. At STP 1 mole of gas occupies 22.414 liters. This volume is what is usually meant by the molar volume, although one can also speak of molar volumes of substances that are not gaseous at STP. Since at STP water occupies very nearly 1 cc per gram, and since 1 mole of water molecules weighs very nearly 18 grams, the molar volume of water is about 18 cc. The molar volume of osmium, one of the densest metals, is only about 8.4 cc; that of beryllium is only about 4.86 cc.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
More on molar volume from Fact Monster:
- gram-molecular volume - gram-molecular volume gram-molecular volume, the volume occupied by one gram-molecular weight of ...
- Avogadro's number - Avogadro's number Avogadro's number [for Amedeo Avogadro], number of particles contained in ...
- Glossary of Chemical Terms - C - calorie · calorimeter · carbocyclic · carbohydrate · carcinogen · catalysis · catalyst · cathode · cation · caustic · chelated · chiral · chlorofluorocarbons · chlorophyll · chromatography · colloid · combustion · composting · condensation · couples · covalent bond · covalent radius · critical pressure · critical temperature
- Encyclopedia: Chemistry: General - Encyclopeadia articles concerning Chemistry: General.