The Chemistry of Gases, Part 3 - Avogadro's Law

Greetings,

This post is about a standard relationship between gas volume and amount (n, mol).  Amadeus Avogadro is credited with the discovery of the standard molar volume theory, which states that 1 mole of any ideal gas will have a volume of 24.414 L when the pressure is 1 atm and the temperature is 273 K.  Avogadro's Law states that, for any ideal gas, the amount (number of moles) is directly proportional to volume (number of liters).  The following diagram provides further explanation.

Determination of Molecular Weight for a Pure Unknown Gas

The concept of Avogadro's Law can even be used to determine the molecular weight of an unknown ideal gas, which in turn is helpful for determining the identity of the gas.  A rearrangement of the Ideal Gas Law Equation combined with substitutions using the relationships, n=m/MM and d=m/V, provides a simple equation for molar mass, MM = (dRT)/P.   The properties of density, g/mL, plus temperature and pressure are easily determined.

That's all for this post.
Thank you for reading!