Mass Spectrometry and Atomic Identification (4E)
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QUESTION
Identify
M
M
M
if an ESI peak at
m
/
z
=
500.5
m/z = 500.5
m
/
z
=
500.5
corresponds to
[
M
+
2
H
]
2
+
[M+2H]^{2+}
[
M
+
2
H
]
2
+
.
QUESTION
Identify the number of chlorines if the isotope cluster shows
M
:
M
+
2
:
M
+
4
≈
9
:
6
:
1
M:M+2:M+4 \approx 9:6:1
M
:
M
+
2
:
M
+
4
≈
9
:
6
:
1
.
QUESTION
Calculate
m
/
z
m/z
m
/
z
for
[
M
+
H
]
+
[M+H]^+
[
M
+
H
]
+
when
M
=
180
M = 180
M
=
180
and
z
=
1
z = 1
z
=
1
.
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ANSWER
181
181
181
. For
[
M
+
H
]
+
[M+H]^+
[
M
+
H
]
+
,
m
/
z
=
M
+
1
m/z = M + 1
m
/
z
=
M
+
1
since one proton adds mass 1 and charge 1.
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