Alchemists based their theories and experiments on the Aristotelian assumption that the world and everything in it are composed of four basic elements (air, earth, fire and water), along with three that were called "essential" substances: salt, mercury and sulfur.
THE FIVE BASIC ELEMENTS of the UNIVERSE: Fire, Earth, Metal, Water, Wood.
I think it’s A (don’t take my word for it just consider that one greatly)
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Answer:
moles O₂ needed = 0.19 mole
Explanation:
4Fe(s) + 3O₂(g) => 2Fe₂O₃(s)
1.396g Fe(s) = 1.396g/56g/mol = 0.025 mole Fe(s)
0.025 mole Fe(s) reacts with 3/4(0.025 mole O₂(g) = 0.019 mole O₂(g)