Question

What is the molecular weight of emthyl oleate?

What are the relative intenities of the M and M+1 peaks ?

Answer 1

molecular weight of methyl oleate is 296.5 g/ mol.

The molecular ion M+ (m/z = 296) is clearly seen.Ions representing loss of the elements of methanol (m/z = 264 or [M-32]⁺and the loss of the McLafferty ion (m/z = 222) are abundant.other peaks are at[M-116]+-m/z=180, 166, 152 etc are found.Hydrocarbon ions (general formula [C_nH_2n-1]⁺) dominate the spectrum, with m/z = 55 as the base peak .The relative abundances of all ions tends to be appreciably greater than in the mass spectra of dienes and polyenes.