A sample of sodium thiosulfate, Na 2 S 2 O 3 , weighing 43.6 mg contains radioactive
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A sample of sodium thiosulfate, Na2S2O3, weighing 43.6 mg contains radioactive sulfur-35 (with mass 35.0 amu). If 22.3% of the sulfur atoms in the compound is sulfur-35 (the remainder is naturally occurring sulfur), how many disintegrations of this nucleus occur per second in this sample? Sulfur-35 has a half-life of 87.9 d.
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