Black Oxide
The black oxide of iron, Fe3O4, occurs in nature as the mineral magnetite. This substance can also be made in
the laboratory by the reaction between red-hot iron and steam according to the following equation.
Fe (s) + H2O (g) yields Fe3O4 (s) + H2 (g)
When 36.0g of H2O is mixed with 167g of Fe, which is the limiting reactant?
correct equation:
3Fe + 4H2O –> Fe3O4 + 4H2
this means: if you take 3 Fe atoms you need 4 molecules of water = you must take a molare ratio of 3:4 for Fe:H2O
n=m/M
n(Fe) = 167 g / 55.85 g/mol = 2.99 mol
n(H2O) = 36 g / 18 g/mol = 2 mol
thus H2O is the limiting reactant (you would need 3.99 mol H2O = 71.78 g)
Hot Black Oxide – Ultra Blak 400 Part 1 – epi’s Eric Olander
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