The
formula
for
methane
gas
is
____________________
,
which
is
one
of
the
components
of
natural
gas
;
constituting
up
to
80%
of
the
gas
mixture
.
Another
gas
that
constitutes
natural
gas
is
propane
,
whose
combustion
reaction
is
as
follows
:
____________________
C3H8
+
____________________
O2
-
-
-
-
-
>
____________________
CO2
+
____________________
H2O
+
Energy
.
Therefore
,
a
complete
combustion
is
carried
out
,
which
is
characterized
by
a
blue
flame
.
This
fuel
comes
from
petroleum
,
but
it
must
be
separated
by
fractional
distillation
in
oil
refineries
.
Another
used
fuel
is
heptane
.
When
it
is
combusted
in
low
oxygen
conditions
,
the
following
reaction
takes
place
:
____________________
C7H16
+
____________________
O2
-
-
-
-
-
>
____________________
CO
+
____________________
H2O
.
In
this
reaction
,
a
yellow
flame
is
observed
,
which
is
characteristic
of
an
incomplete
combustion
.
Another
example
would
be
the
combustion
of
heptadecane
:
____________________
C17H36
+
____________________
O2
-
-
-
-
-
>
____________________
C
+
____________________
H2O
.
Due
to
the
obtained
by
-
products
,
we
can
observe
that
it
is
an
incomplete
combustion
and
it
is
evident
that
little
energy
will
emanate
.
Finally
,
chemists
are
investigating
the
use
of
nonane
as
a
fuel
for
internal
combustion
motor
vehicles
,
whose
complete
combustion
is
:
____________________
C9H20
+
____________________
O2
-
-
-
-
-
>
____________________
CO2
+
____________________
H2O
,
from
which
a
large
amount
of
energy
is
obtained
.
