Thioridazine, C₂₁H₂₆N₂S₂, is a pharmaceutical agent used to regulate dopamine. (Dopamine, a neurotransmitter, affects brain processes that control movement, emotional response, and ability to experience pleasure and pain.) A chemist can analyze a sample of the pharmaceutical for the thioridazine content by decomposing it to convert the sulfur in the compound to sulfate ion. This is then “trapped” as water-insoluble barium sulfate.

Suppose a 12-tablet sample of the drug yielded 0.301 g of BaSO₄. What is the thioridazine content, in milligrams, of each tablet?

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SO4 (aq, from thioridazine) + BaCl₂(aq) → BaSO4(s) + 2 Cl- (aq)