Mole (unit)

Mole is the SI unit used to measure how many molecules or atoms there are. One mole is around 600 sextillion molecules. Scientists use this number because 1 gram of hydrogen is around 1 mole of atoms.

The exact value of one mole is 6.02214078×10²³. This number comes from experiments with carbon because it's easy to work with.^[1][2]

6.02214078×10²³ is also called Avogadro's number, which was named after the person who invented it.

Anything can be measured in moles, but it is not practical for most tasks because the value is so massive. For example, one mole of grapefruits would be as big as the earth.

Because different molecules and atoms do not have the same mass, one mole of one thing does not weigh the same as one mole of something else. Atoms and molecule mass is measured in amu. One amu is equal to one gram per mole. This means that if an atom has a mass of one amu, one mole of this atom weighs one gram.

1. ↑ CIPM Report of 106th Meeting Archived 2018-01-27 at the Wayback Machine Retrieved 7 April, 2018
2. ↑ "Redefining the Mole". NIST. 2018-10-23. Retrieved 24 October 2018.