Question

Provide the molecular formula and the structure given the molecular weight, IR, proton NMR andcarbon NMR.

Provide the molecular formula and the structure given the molecular weight, IR, proton NMR andcarbon NMR.

Answer 1

From molecular wegith: 115 g/gmol

calculate the grams of each :

C% = 62.6% = 115*0.626 = 72g

H% = 11.4% = 13.11 g

N% = 12.3% = 115*.123 = 14.2 g

Now change that to moles!

MWC = 12 g/gmol

MWH = 1 g/gmol

MWN = 14 g/gmol

moles of C = mass / MWC= 72/12 = 6 moles of C

moles of H = mass / MWH =13.11/1 = 13 moles of H

moles of N = mass /MWN = 14.2/14 = 1 mol of N

Compound Formula

C6H13N

this one is probably an amine

CH3-CH2-CH-CH-CH2-CH2-NH2

There is a double bond... we need to use NRM image to find out WHERE it is

From the diagram, there is a C3 peak

CH3-CH2-CH-CH-CH2-CH2-NH2 is correct