If you are after the molecular weights then it is a matter of simple arithmetic (C = 12, H =1, O = 16) using the respective elemental formulas.

The usual characterisation method is GC/MS - do a Google search.

thank you sir

You can using with ZDA method for problem

Make methyl esters then run it with GC-FID, you will find the solution

Based on the literature I've studied, if we get methyl stearate as FAME's molecule model, they possess sufficient polarity in the carboxylic head group to form a bilayer structure with head groups next to each other length of 48 Armstrong (A).

So, one methyl stearate molecule has size of length by 24 A

We can cite:

DOI: 10.13031/2013.25219