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Molar mass is the amount of mass, in atomic units, contained in one mole of a compound. The molar mass of aluminium oxide is 2698 g/mol. Molar mass is a useful property to know when dealing with chemical equations, as it is the quantity used to determine the number of atoms or molecules in a given compound. Molar mass is calculated by multiplying the atomic weight of each element in a formula by its number of atoms, then adding up all the products formed by the elements in the formula.
Metal aluminum is reactive and would quickly corrode under normal conditions, but it forms a strong and durable aluminium oxide film in air that protects it from further oxidation. The strength and hardness of this film, which is also called alumina, makes it useful in engineering ceramics such as high-temperature electrical and voltage insulators, seal rings for gas laser tubes, and parts for thermal testing machines. It is also used as a refractory material to line furnaces, kilns, incinerators, reactors of various types, and crucibles.
Being fairly chemically inert and white, aluminium oxide is a favored filler for many plastics. It is also a common ingredient in sunscreen and is present in most types of glass, including aluminosilicate glasses. It is used in metallurgy to refine and purify aluminium, and in aluminothermy, the process of reducing aluminum from its salts and oxides. It is a catalyst support for industrial reactions such as hydrodesulfurization and some Ziegler-Natta polymerizations.
