5 Questions
What is the numerical value of the Avogadro constant (symbol NA) expressed in mol-1?
6.02214076×10^23
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 does one mole contain?
6.02214076×10^23 elementary entities
How was the mass of a mole of a compound historically related to the average molecular mass of the compound?
Numerically equal
What is the Avogadro number (symbol N0) representative of?
The number of particles in a mole
Study Notes
Avogadro Constant
- The Avogadro constant (symbol NA) is expressed in mol-1 and has a numerical value of 6.02214076 × 10^23.
Definition of the Mole
- The historical basis for the definition of the mole is rooted in the amount of a substance that contains as many particles as there are atoms in 0.012 kilograms of carbon-12.
One Mole
- One mole contains 6.02214076 × 10^23 particles, which can be atoms, molecules, ions, or electrons.
Mass of a Mole
- Historically, the mass of a mole of a compound was related to the average molecular mass of the compound, where the mass of a mole of a substance is equal to its average molecular mass expressed in grams.
Avogadro Number
- The Avogadro number (symbol N0) is representative of the number of particles (atoms, molecules, ions, or electrons) in one mole of a substance, which is equal to 6.02214076 × 10^23.
Test your knowledge of the mole and Avogadro's number with this quiz. Explore the concept of the mole as the measurement unit for amount of substance, and its significance in chemistry.
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