a
2
b
2
P
l
o
t
r
e
a
c
t
i
o
n
/
p
r
o
d
u
c
t
m
a
s
s
e
s
M
W
A
1
0
m
A
5
0
M
W
B
1
0
m
B
5
0
2
A
+
2
B
⟶
2
3
A
2
B
+
2
3
A
B
2
e
x
c
e
s
s
A
(
g
)
r
e
q
u
i
r
e
d
A
(
g
)
0
5
0
.
0
A
2
B
(
g
)
A
B
2
(
g
)
5
0
.
0
5
0
.
0
t
o
t
a
l
r
e
a
c
t
a
n
t
s
(
g
)
t
o
t
a
l
p
r
o
d
u
c
t
s
(
g
)
1
0
0
.
1
0
0
.
m
A
/
(
M
W
A
×
a
)
m
B
/
(
M
W
B
×
b
)
2
.
5
0
2
.
5
0
s
t
o
i
c
h
i
o
m
e
t
r
i
c
s
t
o
i
c
h
i
o
m
e
t
r
i
c
