The quantity of antimony in a sample can be determined by an oxidation–reduction titration with an oxidizing agent. A 7.79 g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq) and passed over a reducing agent so that all the antimony is in the form Sb3+(aq). The Sb3+(aq) is completely oxidized by 36.8 mL of a 0.120 M aqueous solution of KBrO3(aq). The unbalanced equation for the reaction is   BrO3−(aq)+Sb3+(aq)⟶Br−(aq)+Sb5+(aq)(unbalanced)   Calculate the amount of antimony in the sample and its percentage in the ore. mass of antimony: _____________ g   percentage of antimony: ________ %

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