Mass spectrometry analysis of multiple halogen atoms

The peak containing halogen is better judged.Be sure to calculate the peak of the most abundant.That is, 100%.If it is not clear, put your calculations and molecular formulas, we will help you.

Thank you very much:
CHAMDRAW, C16H7BR3CLN3O3EXACT MAS: 560.7726
, the mass spectrum is a typical [M + H] u003d 557.5 BR3Cl ratio
[M + H] 557.5: 559.5: 561.4: 563.4: 565 About 30: 94: 100: 50: 20
The most abundant peak 561 seems to match, but the book is the result of M + 4?
SWEAT:
Ask!:

Don't understand what you mean, my compound also has multiple halogen, molecular ion peaks 2, don't know why?

The landlord calculation is used by the average molecular weight of the element cycle table. It is necessary to calculate the EXACT MS of the element, which is the peak of the highest elements of the elements.

The result is correct
Calculate the chlorine 36.5 actually peak 35 37

Calculate the bromine 80 actually peak 79 81

This will understand that CL2BR2 is calculated.Peak 233
In fact, the peak has a minimum of 228, the maximum is 236

It is an exact quality, and the structure is calculated according to the structural formula, and it is also bid.
There is no problem with other two halogen atoms.

thank you for your reply.
I used precise atomic quality.
BR element Exact mass: 78.9183
M / E: 78.9183 (100.0%), 80.9163 (97.3%)

Cl Exact mass: 34.9689
m / E: 34.9689 (100.0%), 36.9659 (32.0%)