Amedeo Avogadro

1
Amedeo Avogadro

• In order to state that equal volumes of all
  gases at the same temperature and pressure
  contain the same number of molecules, Amedeo
  Avogadro used the ideas of Gay-Lussac in the year
  1811.

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Avogadro's Principle
If we assume that equal volumes of all gases
contain the same number of molecules, then by
measuring the mass of the same volume of
different gases, we can determine the relative
weights of each element. It follows then that a
sample of any element,weighing an amount in grams
numerically equal to its atomic weight, contains
the same number of atoms as any other element
meeting the same requirement.
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The number of atoms in any given element is known
as Avogadro's number and has been determined to
be equal to
6.02 x 1023
4
Avogadros Number
The atomic weight of any element that is being
expressed in grams contains 6.02 x 1023 atoms of
the element.
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The Mole
The molecular weight of a substance expressed in
grams.
6.02 x 1023 H atoms 1 mol H and 6.02 x
1023 Al atoms 1 mol of Al