Two temperature determination of E
a
At temp T
1
ln (
k
at T
1
)
=
ln
A
-
E
a
/ RT
1
At temp T
2
ln (
k
at T
2
)
=
ln
A
-
E
a
/ RT
2
Subtract:
ln (
k
at T
1
)
-
ln (
k
at T
2
)
=
-
E
a
(
1
-
1
)
R
(
T
1
T
2
)
Or
ln [(
k
at T
1
) / (
k
at T
2
)]
=
-
E
a
(
1
-
1
)
R
(
T
1
T
2
)
Knowing
k
at a particular temperature, and
E
a
enables calculation of
k
at any other temperature