The active ingredient in Antabuse, a drug used for the treatment of chronic alcoholism, is tetraethylthiuram disulfide The sulfur in a 0.4169-g sample of an Antabuse preparation was oxidized to SO2, which was absorbed in H2O2 to give H2SO4. The acid was titrated with 19.25 mL of 0.04216 N base. Calculate the percentage of active ingredient in the preparation.

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