EPHEDRINE HCl, C10H15NO.HCl molecular weight MW = 201.73 grams/mole
EPHEDRINE FREEBASE, C10H15NO molecular weight MW = 165.23 grams/mole
The freebase has a melting point 40 deg C with a ½ H2O. The boiling point is 225 deg C.
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(165.23/201.73) x 100 = 81.9% is EPHEDRINE of the EPHEDRINE HCl
(36.5/201.73) x 100 = 18.1% is HCl of the EPHEDRINE HCl
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81.9% + 18.1% = 100% or 165.23 + 36.5 = 201.73 for EPHEDRINE HCl, C10H15NO.HCl