Molar Volumes of a Gas
The molar volume of all ideal gases at STP is 22.4 liters. The value of Avogadro’s constant k can be derived from the following equation:
k = RT/P (at constant pressure and temperature)
At standard temperature and pressure, the value of T = 273 K, P = 101.325 kPa, P = 8.314 joule.mol-1.K-1. Thus the volume of one mole of a gas at STP is,
Volume of 1 mole of gas = (8.314 J.mol-1.K-1)×(273 K)/(101.325 kPa) = 22.4 liters
Moles to Gram
The following formula shows how to change from moles to gram, which is another common unit of measure:
Moles = grams/molar mass
Avogadro’s Law
Avogadro’s Law was invented by Amedeo Carlo Avogadro in 1811. He was an Italian chemist and mathematician physicist. He said that, at constant temperature and pressure, two different ideal gases with similar volumes must contain an equal number of molecules. This law can be derived from the ideal gas equation.
In this article, we will discuss Avogadro’s law, its formula, derivation, application, and other aspects facts related to it in detail.