5 Questions
What is the historical basis for the definition of the mole?
The amount of substance that corresponds to the number of atoms in 12 grams of 12C
What is the numerical value of the Avogadro constant?
6.02214076×10^23
What type of entities can one mole contain?
Atoms, molecules, ions, or other particles
What is the unit of measurement for amount of substance?
Mole
With the 2019 redefinition of the SI base units, what can be assumed for all practical purposes regarding the numerical equivalence of the mole?
It is only approximate
Study Notes
Historical Basis of the Mole
- The mole has a rich historical background, with its definition influenced by the development of the periodic table and the understanding of atomic weights.
Avogadro Constant
- The Avogadro constant (NA) has a numerical value of 6.02214076 × 10^23 particles.
Entities in One Mole
- One mole can contain 6.02214076 × 10^23 particles of any substance, including atoms, molecules, ions, or electrons.
Unit of Measurement for Amount of Substance
- The mole (mol) is the unit of measurement for the amount of substance.
2019 Redefinition of SI Base Units
- With the 2019 redefinition of the SI base units, the mole can be assumed to be equivalent to the exact number 6.02214076 × 10^23 particles for all practical purposes.
Test your knowledge of the mole and Avogadro's number with this quiz. Explore the concept of the mole as the unit of measurement for the amount of substance and its significance in chemistry.
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