5 Questions
How many elementary entities are there in one mole?
6.02214076×10^23
What is the numerical value of the Avogadro constant (symbol NA) expressed in mol-1?
6.02214076×10^23
What is the unit of measurement for amount of substance?
Mole (mol)
What does the mole represent historically?
The amount of substance that corresponds to the number of atoms in 12 grams of 12C
With the 2019 redefinition of the SI base units, what is the numerical equivalence of the mole now?
Approximate
Study Notes
Amount of Substance
- There are 6.02214076 × 10^23 elementary entities in one mole.
- The Avogadro constant (NA) is 6.02214076 × 10^23 particles per mole (mol-1).
- The unit of measurement for amount of substance is the mole (mol).
- Historically, the mole represents the amount of a substance that contains as many particles as there are atoms in 0.012 kilograms of carbon-12.
- As of 2019, the mole is defined as containing exactly 6.02214076 × 10^23 particles, which is the numerical equivalence of the mole.
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 amount of substance and its significance in chemistry.
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