Mass to charge ratios dealing with subatomic particles

[Ttan]

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Say you have Br- with its atomic mass of 80u. How would i turn around and calculate its approx. mass to charge ratio? (should come out to 8.3x10^-7 kg/C if my textbook is correct)

I have read what my gen chem textbook has to say about this issue, but not able to find actual explanation to this concept.

Basically, I sort of know it, but don't completely understand it, anyone mind explaining the concept to me in full?

 

[Isoprop]

it's just mass divided by charge.

one bromide ion has a mass of 80 u.
it has a charge of -1 elementary charge (the charge of 1 electron).

so it's -80u/e. Convert units to kg/C.

Also, you could figure out the mass of 1 mole of bromide ions and divide that by the charge of 1 mole of electrons.