The answer to this question, considering Cocaine.HCl salt, is about 89%.
calculations:
molar mass Cocain: 303.353
molar mass HCl: 36.46
molar mass Cocain.HCl: 339.813
mass% of Cocain in Cocain.HCl: 303.353/339.813 x 100% = 89.27 %
I hate with a passion that all these drug using not-so-genius people got wind of how to break down a molecule like this.
NO, THE PUREST COCAINE HCL, (AKA, THE COCAINE SOMEONE SNORTS, AKA JUST COCAINE) IS NOT 89.27% PURE COCAINE, IT'S 100% PURE COCAINE.
NO, PURE MDMA (mdma hcl, what those ravers want) IS NOT JUST 84% PURE, IT'S 100 PERCENT PURE.
Whenever anybody talks about cocaine, it's cocaine HYDROCHLORIDE (unless they're talking about crack). Whenever anybody talks about ecstasy, they SHOULD mean mdma, aka mdma HCL, as that is what gets them high. Breaking down the molecule as you've done just gives off a smart-ass vibe, filled with wrongness.
Stop spreading this stupid idea.
this post has been de-douchified by myself before getting posted, to not qualify as being too harsh to another member as I've been written up for before (

Cpt. Heroin ).
oh yeah one last thing, YOU DON'T EVEN SPELL THE DRUGS NAME RIGHT 80% OF THE TIME IN YOUR POST.