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

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

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".