A + B
→
Product
E
a
Rate = (# of collisions per second) X (fraction collisions having E > E
a
)
exp(E
a
/RT)
Rate Depends on Collision Frequency (Z
11
)
and Boltzmann Factor (e
Ea/RT
)
P
Rate =
{ Z
11
(10
8
M s
1
)
}
X
{ exp(0/RT)
}
=
10
8
M/s
2
2
11
2
2
⎟
⎠
⎞
⎜
⎝
⎛
=
V
N
c
d
Z
π
If every collision produces product, then Rate = 10
8
M/s (upper limit).
Fastest reaction rate in solution is ~10
10
M/s for H
+
+ OH

→
H
2
O
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