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 the following: 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g).
(a) When 36.0 g H2O are mixed with 67.0 g Fe, which is the limiting reagent?
(b) What mass in grams of black iron oxide is produced?
(c) What mass in grams of excess reactant remains when the reaction is completed?