Avogadro's Law Equal volumes of all gases at the same pressure and temperature
contain the same number of molecules
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| Amadeo Avogadro (1776-1856) Credit: Neveshkin Nikolay / Shutterstock.com |
When you break NH3 molecule into N2 and H2 gasses and you measure them, you will get the hydrogen gas three times the volume compared to the nitrogen gas at the same pressure and temperature. Based on Avogadro Law, the number of hydrogen molecules is three times than nitrogen gas. But, who is Avogadro?
Amadeo Avogadro's full name is Lorenzo Romano Amedeo Carlo Avogadro. He's a professor of Physics and Mathematics at the Royal College in Vercelli (1809-1821) and a Chair of Mathematical Physics at Turin (1821-1850).
Mole unit is expressed as the number of particles in a substance. The scientists agree that one mole of a substance containing the same number of particles in 12 g of the C-12 isotope was 6.02 x 1023 particles. This number of particles is called an Avogadro's number (NA). For instance, one mole is a different mass for different compounds.
You can convert mole to mass.
Mass (g) = moles x NA (gmol-1)
References:
- Allain, R. 2015. Even Avogadro Didn't Know Avogadro's Number.
- Rapp, B. E. 2017. Thermodynamics. Microfluidics: Modelling, Mechanics and Mathematics. 93-135.