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Lu-Yang Wang has written:
'Cellular electrophysiologic actions of mexiletine combined with amiodarone in papillary muscles of guinea-pigs'
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.