Chemistry

Sulfamethoxazole has the molecular formula C10H11N3O3S.

10.0 g of tablets containing sulfamethoxazole and trimethoprim were crushed and dissolved in water. A strong oxidising agent was added, which converted all the sulfur in the sulfamethoxazole into sulfate ions.

Following this, an excess of barium nitrate was added which resulted in precipitation of barium sulfate with no remaining sulfate ions in solution.

If the mass of the precipitate obtained was 2.2758 g, what is the percent by mass of sulfamethoxazole in the tablets, assuming that all of the sulfur present came from sulfamethoxazole?

asked by M
  1. g BaSO4 x (molar mass sulfa stuff/3*molar mass BaSO4)*100 = ?

    posted by DrBob222
  2. The Student integrity officer from CHEM1100 would like to talk to you.
    1. Do your own assessed work.
    2. Do not post copyright material to internet forums.

    posted by Philip

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