Interpreting NMR Spectrum Hello So the question says to inte

Interpreting NMR Spectrum.

Hello. So the question says to intepret the NMR spectrum by providing a list of peak positions and their assignment to hydrogens (protons) present in the biodiesel molecule. Why do you see peaks in the 4.5-6.5 ppm region? (NMR provided below, first image is pure veg. oil) And if the 60 ml of vegetable oil ( density = 0.917 g/ml) used in the experiment were used, I got 165.66 g of isolated biodiesel, what was the percent yield? I got 99% but I may be wrong. Thank you ahead of time.

Samp2e #100, 0p.raser ; J.neder.on Pulse 4 0 degrees 97876468 10 7.62

Solution

Peak near 4.5 ppm is observed due to H attached to carbon which is further attached to oxygen or oxygen attached carbon,peak near 6 is because of H of double bonded carbons

Mass of fatty acid= density*volume=55.02g

55.02 g of vegetable oil give =165.66g

%yield= (actual yield/theoretical yield)*100

( 165.66/theoretical yield)*100

{Theoretical yield need to be Provided as which vegetables oil used is not mentioned}