Molar volume can be found by calculating the quotient of the molar weight of a substance and its molar density. By definition, molar volume is the mass occupied by 1 mole of the substance, according to Reference.com. The standard unit for volume, including molar volume, is the liter.
At standard temperature and pressure, the molar volume of any ideal gas is 22.4 liters. This volume is derived from the ideal gas law, stated by the equation PV=nRT. In this equation, P represents pressure in atmospheres, V is volume in liters, n is the number of moles, R is the universal gas constant and T is temperature in degrees Kelvin.
The mole is a unit of measure used in science to represent the mass in grams of Avogadro's number of atoms, molecules or ions of a substance. Avogadro's number is 6.022 x10^23 and is based on the number of atoms in 12 grams of carbon-12. Thus, molar volume is the volume occupied by 6.022x10^23 atoms of an element at the stated temperature and pressure.
Molar volume is useful when scientists work with crystalline substances. When working with silicon, they use the molar volume to determine the volume of a single crystal. These calculations have real-world applications in the electronics industry, in which manufacturers may require a single crystal of ultra-pure silicon.