After Chemical Analysis, a Radioactive Sample Is Found to Contain

question 69

Multiple Choice

After chemical analysis, a radioactive sample is found to contain 1.00 g of francium to every 2.50 g of astatine, its daughter isotope. If the half-life of francium is 4.18 min, approximately how old is the sample?

• A) 7.65 min
• B) 7.56 min
• C) 5.67 min
• D) 5.76 min
• E) 6.57 min

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