Avogadros number

Avogadro's number ävōgä´drō [for Amedeo Avogadro ], number of particles contained in one mole of any substance; it is equal to 602,252,000,000,000,000,000,000, or in scientific notation, 6.02252×10 ²³ . For example, 12.011 grams of carbon (one mole of carbon) contains 6.02252×10 ²³ carbon atoms, and 180.16 grams of glucose, C ₆ H ₁₂ O ₆ , contains 6.02252×10 ²³ molecules of glucose. Avogadro's number is determined by calculating the spacing of the atoms in a crystalline solid through X-ray methods and combining this data with the measured volume of one mole of the solid to obtain the number of molecules per molar volume.

Avogadro constant (Avogadro number) The number of molecules, atoms, or ions in one mole of a substance: 6.02252 × 10²³ per mol. It is derived from the number of atoms of the pure isotope ¹²C in 12 grams of that substance and is the reciprocal of atomic mass in grams.