Avogadro constant
The number of particles in one mole of any substance. Its value is 6.02 x 10^23 per mole.
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Analogy
Just as 12 is the number in a dozen, this is the number in a mole.
Example
Particles = moles x 6.02 x 10^230.5 mol of atoms= 3.01 x 10^23 atoms
In practice
Two moles of water contain 2 x 6.02 x 10^23 water molecules.
Practice
Flashcards
- What is the Avogadro constant?6.02 x 10^23, the number of particles in one mole.
Questions people ask
Who was Avogadro?
Amedeo Avogadro was an Italian scientist in the early 1800s. He suggested that equal volumes of different gases at the same temperature and pressure hold the same number of particles. The constant was named in his honour, though it was measured long after he died.
How do you use the Avogadro constant in a calculation?
Multiply the number of moles by 6.02 x 10^23 to get the number of particles. For 2 mol of water, you have 2 x 6.02 x 10^23 = 1.204 x 10^24 molecules. To go the other way, divide the number of particles by the constant to get moles.