Chemistry Olympiad national qualifying exam NQE 2012

[alexandred]

yea i looked for peaks which were 2amu apart, but i swear the absolute highest peak was always in the middle?
am i getting something wrong?

Highest peaks (highest intensity) != highest mass/z, which is what we want. The intensity measures something else; we were after highest x value not highest y.

[tim69mit]

I do school chem, i manage to do the multiple choice, but i dont get how to do all the long questions. Can someone tell me how to do each of these?

1)The question with the spectrometry graphs (peask and stuff)

2) the question with the stretching of bonds

3) and the calculation one which was some sort of EDTA titrations?

[tim69mit]

Any one?

[james1996mcneil]

What did you get for the EDTA calculations?