When hydronium and hydroxide neutralize each other as they react in equal amounts, what is true of their molarities?

fe 55.85 g/mol and h2o 18.02 g/mol.

it is b that is the answer.

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".