## Avogadro`s number, the Mole

1 Mole is. 6.023 x 1023 molecules

A Mole is unit of measurement.
It is also known as Avogadro`s number or Avogadro`s constant It was discovered by Jean Baptiste Perrin, who named it after Amedeo Avogadro who discovered Avogadro’s law

Avogadro’s law states that – under the same condition of temperature and pressure, equal volumes of all gases contain the same number of molecules.

e.g. 1000 molecules of N2 takes up the same volume of CH4

This allowed scientists to work of the relative molecular mass (RMM) of gases. Today we can work out the RMM of any molecule from the periodic table. Which saves us a lot of work!

Avogadro`s number, the Mole (Mol) is incredibly useful as it allows us to compare any substance, atom or molecule by converting the mass or volume in to the equivalent numbers of moles.

We can’t compare the number of molecules in 1g of Iron with 1 g of Iron oxide- it is a bit like comparing 1 kg apples and 1 kg raisins

But we can compare 1 mole of Iron with 1 mole of Iron oxide as they both contain 6.023 x 1023 molecules!

Mole Calculations

The Mole(s) of and any substance can be calculated from the mass of the sample divided by the RMM

Mol = Mass(g)/RMM(g)

Why is a Mole called a Mole?

Ostwald, a German scientist came up with the name which is bases on the ideal gas concept which is linked into Avogadro`s number and Avogadro’s law.

Nothing to do with the furry little critter that digs holes in your lawn!

###### Attribution: Mikiwikipikidikipedia at en.wikipedia
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