A number equal to the sum of the atomic masses
of the atoms
in a molecule
. The molecular mass gives the mass
of a molecule
relative to that of the 12
C atom, which is taken to have a mass of 12.
The molecular mass of C2
is approximately 30 or [(2 x 12) + (6 x 1)]. Therefore the molecule
is about 2.5 times as heavy as the 12
C atom or about the same mass
as the NO atom with a molecular mass of 30 or (14+16).
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