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A1
equations
relative atomic mass
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Relative atomic mass of an element is the
mean
mass of the
isotopes
of an
element
compared to 1/
12
of the of the mass of a
carbon-12
atom.
One isotope has a mass of 35 with a relative abundance of 75%, the other has a mass of 37 with a relative abundance of 25%.
Ar = (
35
x
75
) + (
37
x
25
) =
35.5
(
75
+
25
)
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