x 10^(23) is also known as Avogadro's constant (L). It is named after an Italian scientist - Amedeo Avogadro. He discovered that equal volumes of gases when under the same conditions contain the same amount of molecules. Scientists used this discovery to calculate Avogadro's constant.Avogadro's constant (L) is the number of atoms in 12 grams of carbon-12 or 6.022 x 10^(23). We give it the units mol^-1, which you read as 'per mole'.