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The balnced eqution for the reaction of antimony and oxygen would be 4Sb + 3O2 -> Sb4O6 Sb4O6 is the gas phase molecular form of antimony oxide, Sb2O3 and has a structure like phosphorus trioxide, P4O6
The name of the formula Sb4O6 is Tetraantimony Hexoxide.
Though really its just 2 moles of Sb2O3, or antimony trioxide, its Sb4O6
The properly written formula is Sb4O6, showing that each unit contains 4 antimony atoms and 6 oxygen atoms. The gram atomic mass of oxygen is 15.9994 and that of antimony is 121.75. Therefore, the percent by mass of oxygen is 100{(6)(15.994)/[(4)(121.75) + (6)(15.994)} or 16.466, to the justified number of significant digits. (The integers 4 and 6 are exact).