A rock contains 120 umol of 238U (t1/2 = 2.5x10° yr) and 170 umol of 206Pb. Assuming that all the 206pb comes from decay of the 238U, estimate the rock's age.

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Q: 238.050784 u, 234.043593 u and 4.002602 u respectively.

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Q: A particular rock is thought to be 234 million years old. If it contains 4.84 mg of 238U, how much…

A: Given : t = 234 million years = 234 × 106 years m = 4.84 mg t1/2 = 4.47 × 109 y

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