Molecular weight
Definition of Molecular weight
(Chem.)
the
weight
of
a
molecule
of
any
gas
or
vapor
as
compared
with
the
hydrogen
atom
having
weight
of
1
as
a
standard
;
the
sum
of
the
atomic
weights
of
the
constituents
of
a
molecule
;
thus
,
the
molecular weight
of
water
(
H2O
)
is
18
.
For
more
precise
measurements
,
the
weight
of
the
carbon
isotope
carbon-12
is
used
as
the
standard
,
that
isotope
having
the
value
of
12
.
000
.
In
this
systen
,
now
used
almost
universally
,
the
hydrogen
atom
has
a
weight
of
1
.
0079
.
See also:
Molecular
Related Words
chemical
science
,
chemistry
,
mass
,
relative
molecular
mass
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