Errata in H3 chem spectroscopy tutorial answers

Hi all,

referring to part 2 question 7.

The answer should be: Nitrogen has an odd valency and form 3 bonds. Hence a molecule containing an odd number of nitrogen atoms will have an odd number of hydrogen atoms. Since C, O, N have an even mass number but H has an odd mass number, an odd number of hydrogen atoms will make the total Mr an odd number, giving an odd-numbered M+ peak.