Haloperidol is a typical antipsychotic that treats schizophrenia mostly, decreasing the hallucinations, delusions, and flat affect. Procyclidine is an anticholinergic drug that is used to decrease the loss of voluntary muscle control (called pseudoparkinsonism) associated with typical antipsychotics like haloperidol. Lorazepam is a benzodiazepine used to treat anxiety and insomnia.

8.3 grams HCl (1 mole HCl/36.458 grams)

= 0.23 moles HCl

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This is how you write HCl (Hydrochloric acid) in water:

HCl (aqueous) or short form HCl(aq)

The chemical formula (not symbol) of hydrogen chloride is HCl; for a diluted solution you can use "HCl dil." but this isn't a standard formula.

1 m HCl is not more reactive than 4m HCl, but 4m HCl is more concentrated.