Final answer:
Cocaine hydrochloride contains about 99 percent pure cocaine, offering a high purity level for the substance, which contrasts with the more volatile crack cocaine.
Step-by-step explanation:
Cocaine hydrochloride, which is a form of cocaine used frequently, contains a high purity level of the substance. Considering the options provided and the nature of this chemical compound, the accurate answer is that cocaine hydrochloride typically contains about 99 percent pure cocaine. This high level of purity is because it is usually manufactured to be water-soluble, which facilitates its absorption through the watery mucous membranes when snorted. Cocaine as a salt, in the form of cocaine hydrochloride, contrasts with crack cocaine, which is a free (unneutralized) base and forms broken lumps. Crack cocaine is recognized as being more volatile than cocaine hydrochloride, and it vaporizes quickly at high temperatures.