Does molecular weight determine the size of the particle? What is the correlation between molecular weight and size of the particle? Suppose molecular weight of the compound is approximately MW 320 then what would be the size of the particle?
Your question is too general. It seems you need to look at Bondi's method (Bondi, A., J. Phys. Chem. 68 (1964) 441) for calculation of molecular volume (I read it from van Krevelen 1990 Properties of Polymers 3rd Ed., Elsevier). You can adapt it to calculate length, after assuming configuration of your molecule. More modern method is to use software for quantum chemical calculations - but again the result will depend on your assumption for solvent, etc.
I did some calculations, using Bondi's method. Assuming extended linear hydrocarbon, each -CH2- (MW addition of 14) adds 0.121 nm. So MW of 320 could have length of up to 2.77 nm (if it is an extended linear hydrocarbon).
ya its general.. just i want to know what is the relation between molecular weight and particle size?
As long as you do not speak about nanodots and similar there is no relation. Particles of silica can be larger or smaller than e.g. polymer particles.
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