11)
ln[R]1– ln[R]2 = – kt1 – (–kt2)
[
]
[ ]
(
)
−
=
1
2
1
2
lnR
R
t
t
k
(
)
[
]
[
]
1
2
1
2
1
R
ln
R
k
t
t
=
−
(3 13)
Equation (3 9) can also be written as
[[ ]
]
= −
0
R
ln
R
kt
Taking antilog of both sides
[R] = [R]0 e–kt
(3 14)
Comparing equation (3