Twenty vitamin C tablets (total mass = 6.3561 g) were powdered and 0.3181 g dissolved in dilute sulphuric acid. This solution was then titrated with 0.0973 M ammonium cerium (IV) sulphate and 23.24 mL required to reach the end-point. Given that ammonium cerium(IV) sulphate reacts with ascorbic acid in a 2:1 ratio, calculate the mass of ascorbic acid (in mg) per average tablet. Mr (Ascorbic acid, C6H8O6) = 176.12

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