1) In silver chloride, AgCl, there are 32.8845 parts chlorine (by mass) for every 100.000 parts silver. What is the atomic weight of silver if the atomic weight of chlorine is 35.500?
2) In silver sulfide, there are 14.852 parts sulfur (by mass) for every 100.000 parts silver. What is the atomic weight of sulfur if the formula for silver sulfide is AgS? What if the formula is Ag2S?
3) Silver chloride can be precipitated quantitatively by reaction of a soluble silver salt such as silver nitrate with potassium chloride:
Ag+(aq) + KCl(aq) -- > AgCl(s) + K+(aq) .69.103 parts of KCl (by mass) reacts with 100.000 parts silver. What is the atomic weight of potassium?
Jean Charles de Marignac, "Researches on the Mutual Relations of Atomic Weights by J. S. Stas," Bulletin de l'Acad. Royale de Belgique, [2] 10, No. 8. [Reprinted and translated in its entirety in Alembic Club Reprint #20, Prout's Hypothesis from Bibliothèque Universelle (Archives) 9 (1860), 97-107.]
Stas did the experiments and published the results; presumably data may be found in his original paper. The excerpt of Stas's paper in the Alembic Club Reprint and on the internet, however, omit the data and include only conclusions and interpretation. Marignac's paper, which is a commentary on Stas's, includes a summary of the data. That summary appears in the Alembic Club and internet excerpts, and that is where I drew the data for these exercises.
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