Avogadro.27s_law Gas

in 1811, amedeo avogadro verified equal volumes of pure gases contain same number of particles. theory not accepted until 1858 when italian chemist stanislao cannizzaro able explain non-ideal exceptions. work gases century prior, number bears name avogadro s constant represents number of atoms found in 12 grams of elemental carbon-12 (6.022×10 mol). specific number of gas particles, @ standard temperature , pressure (ideal gas law) occupies 22.40 liters, referred molar volume.

avogadro s law states volume occupied ideal gas proportional number of moles (or molecules) present in container. gives rise molar volume of gas, @ stp 22.4 dm (or litres). relation given by

v

1



n

1




=



v

2



n

2







{\displaystyle {\frac {v_{1}}{n_{1}}}={\frac {v_{2}}{n_{2}}}\,}

where n equal number of moles of gas (the number of molecules divided avogadro s number).