Black Magnetite
Black Magnetite
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)
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