The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 8.35-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 Sb (aq). The Sb^3+ (aq) is completely oxidized by 39.5 mL of a 0.120 M aqueous solution of KBrO_3(aq). The unbalanced net ionic equation for the reaction is: BrO_3^- (aq) + Sb^3+ (aq) rightarrow Br^- (aq) + Sb^5+(aq) Calculate the amount of antimony in the sample (in grams) and its percentage in the ore.