Avogadro's law is a principle stated by the Italian chemist Amedeo Avogadro (1776-1856) in 1811.
The avagadro's law states that under equal conditions of temperature and pressure, equal volumes of gases contain an equal number of molecules.
Avogadro's number is 6.022 * 10 23. This means that 12 grams of carbon-12 contains 6.022 * 10 23 carbon-12 atoms.
For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.
The avagadro's law is expressed as: where: V is the volume of the gas. n is the amount of substance of the gas (measured in moles). k is a constant.
Because the formula is equal to a constant, Avagadro's law can be rewritten as:
Example 1: How many moles are there in one atom?