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21.3 Exercise 21

Avg difficulty 2.5

A sample of rock was found to contain 8.23 mg of rubidium-87 and 0.47 mg of strontium-87.

(a) Calculate the age of the rock if the half-life of the decay of rubidium by β emission is 4.7 ×\times 1010 y.

(b) If some 3887Sr _{38}^{87} \text{Sr} was initially present in the rock, would the rock be younger, older, or the same age as the age calculated in (a)? Explain your answer.

OpenStax Chemistry 2e, 21.3 Radioactive Decay, exercise 21

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Adapted from General Chemistry © 2019 Rice University. Licensed under CC BY 4.0. Sources: Chemistry 2e, Chemistry: Atoms First 2e. Imported at revision 32c7196.