Mass Spectrometry...

spoinkytheduck

Can anyone help me with this question on mass spectrometry.. I'm a bit stuck... :smile:

State how the relative molecular mass of a covalent compound is obtained from it's mass spectrum.

If you are a 'bit' stuck on this question I suggest you read up on the absolute basics of mass spectrometry

Reply 2

spoinkytheduck

OP

12

charco

If you are a 'bit' stuck on this question I suggest you read up on the absolute basics of mass spectrometry

I know its veery basic ... I just dont get the covalent compounds bit... do you just add up the relative atomic masses of each of the atoms in the molecule... (as I guess the molecule is split up due to losing the electron(s) that keep them together)...????

Reply 3

spoinkytheduck

I know its veery basic ... I just dont get the covalent compounds bit... do you just add up the relative atomic masses of each of the atoms in the molecule... (as I guess the molecule is split up due to losing the electron(s) that keep them together)...????

The peak at the highest m/z is the molecular ion [M]⁺

Reply 4

chemicalguy

3

Covalent (organic) compounds can get fragmented in a mass spec. In A2 you will learn how to use these fragments to identify compounds.

The mass spec gives info on m/z ratio and abundance. For an organic compound the peak with the highest m/z ratio is equivalent to the RMM of the compound as it has the mass of the unfragmented molecule. It's called the molecular ion.

(edited 14 years ago)

Reply 5

spoinkytheduck

OP

12

Ah, rightyho that makes sense...and yes I realise it was quite obvious... :smile:

Thank you!!!

Reply 6

Gelflite

Original post by charco

If you are a 'bit' stuck on this question I suggest you read up on the absolute basics of mass spectrometry

****ing beg

Reply 7

Original post by Gelflite

****ing beg

Congratulations - you win the necrophiliac of the month award

this thread died four years ago ... :eek:

Reply 8

Donladmodge

Your mum ****s horses

Reply 9

RoyalBlue7

19

Grave diggers :rolleyes:

Reply 10