Answer:
divide m/z by 13. In this situation, 72/13.
72/13 = 5 + 7/13 .
use formula
C
n
H
+
r
.
where; n = 5 and r = 7.
by inserting the value of n and r into the formula, we get,
5
12
Step-by-step explanation:
hope it was helpful
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