Very simple to do... Just obtain the molecular weights of all the fatty acids present in sunflower seed. Add up and find the average. The mole is calculated as weight obtained divided by the average mol weight of the FA i.e. 100g / Average Mol.wt
Thank you.
This reference may help you further. http://biodiesel.org/docs/ffs-performace_usage/chemical-weight-formula.pdf?sfvrsn=4