NEED HELP ASAP Iron turns to rust by the reaction 2Fe(s) + 3O₂(g) --> 2Fe₂O₃(s). Calculate the mass of iron needed to fully react with 18.0 moles of oxygen gas.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

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".