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Rubidium-87 decays by β production to strontium-87 with a half life of 4.7 × 1010 years....

Rubidium-87 decays by β production to strontium-87 with a half life of 4.7 × 1010 years. What is the age of a rock sample that contains 105.9 µg 87Rb and 7.9 µg 87Sr ?

____ years old

Assume that no 87Sr was present when the rock was formed.
The atomic masses are given in the table below:

Nuclide Atomic Mass
87Rb 86.90919
87Sr 86.90888

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queen_honey_blossom answered 2 years ago
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