How to determine mass percentage of oil from different oil seeds Share with your friends Share 4 Vartika Jain answered this Dear Student, Mass percentage of oil can be calculated as, Mass percentage of oil=Mass of oilTotal mass of all oils×100Eg. if a g of sunflower oil, b g of flaxseed oil and c g of sesame oil is present, then mass % of sunflower oil ismass % of sunflower oil=aa+b+c×100 1 View Full Answer Eshan Singh answered this (Mass of particular oil/sum of mass of different oils in that seed) *100 3