(Solution) - The decay of Rb 87 t1 2 4 8 1010 y -(2025 Original AI-Free Solution)

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The decay of Rb-87 (t1/2 = 4.8 × 1010 y) to Sr-87 has been used to determine the age of ancient rocks and minerals.
a. Write the balanced nuclear equation for this decay.
b. If a sample of rock is found to be 0.100% by mass Rb-87 and 0.00250% Sr-87, what is the age of the rock? Assume that there was no Sr-87 present when the rock formed.