The answers will depend on whether you mean a drop of alcohol or a bottle or a vat. Furthermore, it will depend on the type of alcohol: methanol, ethanol, propanol, etc.
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Density = Mass / Volume Rearranging this gives: Volume = Mass / Density Mass = Density × Volume
% of volume = 100*(volume of substance that you are interested in)/(total volume) % of mass = 100*(mass of substance that you are interested in)/(total mass).
density=mass/volume volume=mass/density
You have to know two out of three ... mass, volume, density ... then you can find the missing one. If density is missing . . . Density = (mass)/(volume) If mass is missing . . . Mass = (density) x (volume) If volume is missing . . . Volume = (mass)/(density)
Density= mass/volume volume = mass/density