Vitamin C has the formula C₆H₈O₆. Besides being an acid, it is a reducing agent. One method for determining the amount of vitamin C in a sample is to titrate it with a solution of bromine, Br₂, an oxidizing agent. 

A 1.00-g “chewable” vitamin C tablet requires 27.85 mL of 0.102 M Br₂ for titration to the equivalence point. What is the mass of vitamin C in the tablet?

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C6H8O6(aq) + Br₂(aq) → 2 HBr(aq) + C6H6O6(aq)