Avogadro's number (generally written as 6.02 x 10^23) is the number of atoms or molecules it takes to have one mole of a particular atom or molecule. For example, one mole of Hydrogen is just 6.022x10^23.
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It's not; the number 6.022x1023 represents how many molecules are in a "Mole". A Mole is just another measuring unit created to make it less painful to do the problems.
It also makes it possible to convert from things such as grams to liters, molecules to grams, liters to molecules, etc...
Avogadro's number ( ~ 6.02 x 1023 ) is the number of particles in a mole.
( mole aka gram molecular weight)
The unit is "per mole", or mol^-1.
A mole of any substance has the Avogadro's number of such units. As an example, a mole of hydrogen atoms is equivalent to 6.022 x 1023 atoms.
Avogadro's number represents the number of units of a substance in one mole of the substance. These units may be electrons, atoms, ions, or molecules, depending on the substance.
By saying Avogadro's number of atoms, you are saying one mole (or 6.02 × 1023 atoms). And one mole of any elements is its atomic mass. Phosphorus' atomic mass is 31.0 grams
1 mole of gas at STP occupies 22.4 liters.