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See also: Mole

The mole (symbol: mol ) is a basic Unité of the international system, appeared in 1972, which is mainly used in Physique and Chimie. A mole of atoms contains approximately 6,022×10²³ atoms (a more correct approximation would be 6,02214179 (30) ×10²³). This number is called Nombre of Avogadro, its symbol is NA. This number is the number of atoms present in exactly 12 G of ¹²C.

The mole corresponds to the Quantité of matter of a system containing as many individual particles than there are atoms in 12 G of Carbone ¹²C.

Formulated in a more comprehensible way, the mole is a unit of counting as well as the " vingtaine" or the " douzaine". Same manner, that there are as many elements in a dozen apples than in a dozen eggs, there is the same number of atoms in a mole of carbon as in a mole of lead.

A normal matter sample contains a very great number of Atome S. For example, 6 gram of aluminum contains approximately 1,1 × 10²² atoms (: 11 000.000.000 000.000.000 000 atoms). To avoid the use of also great numbers, one created a measuring unit, the mole.

Multiples of the mole

Its submultiple more the current is the millimole (mmol) = 10^-3 mol.

When it is question of mole, it is essential also to indicate the nature of the elementary entities. Those can be:

of the Atom S
of the Molecule S
of the Ion S
of the electron S
of other particles
of the groups of particles

To give an order of magnitude, a mole of seconds accounts for 4 billion times the estimate in 2007 of the age of the ground.

Formulate

$\ mathrm {N = \ frac {m} {M}}$

N: quantity of matter in mol
m: mass compound in G
M: molar Mass of composed in $\ mathrm {G \ cdot mol^ {- 1}}$

See too

Quantity of molar matter
Concentration
molecular Mass
molar Mass
molar Volume
Number of Avogadro

External bonds

'' the mole '' on the site of the academy of Rouen P.Lambert-Charreteur - October 2001

Simple: Mole (links)

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