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2.1: RELATIVE ATOMIC MASS, Ar
"The Relative Atomic Mass, Ar, is the weighted average mass of
an
atom of an element, taking into account its naturally occurring
isotopes, relative to 1/12th the relative atomic mass of an atom of
Carbon-12"
Relative Atomic Mass, Ar = The average mass of an atom x 12
The mass of one atom of carbon-12…read more

Slide 3

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2.1: RELATIVE MOLECULAR MASS, Mr
"The Relative Molecular Mass, Mr, of a molecule is the mass of
that
molecule compared to 1/12th the relative atomic mass of an atom
of
Carbon-12"…read more

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2.1: THE AVOGADRO CONSTANT
If we weighed out the RAM, Ar, of any element, in grams, this
amount will also contain the same number of atoms.
If we weight out the relative or formula mass, Mr, of a
compound in grams they will have the same number of entities
(e.g. atoms, molecules, ions).
602 200 000 000 000 000 000 000 = 6.02 x 10 23 ­ This is known
as Avogadro's Constant.
"The definition of the Avogadro's Constant or Avogadro's
Number is the number of atoms in 12g of Carbom-12"…read more

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2.1: THE MOLE
The amount of substance that contains 6.022 x 1023 particles is
called the mole.
Mass in g
Number
=
In Moles
Mass of 1 mole in g…read more

Slide 6

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2.1: MOLAR MASS
Molar Mass = the mass per mole of substance (gmol-1 or
Kgmol-1)
The molar mass in gmol-1 is numerically the same as Mr…read more

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