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A moon rock collected by a U.S. Apollo mission is estimated to be 4.20 billion years...

A moon rock collected by a U.S. Apollo mission is estimated to be 4.20 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of 206Pb per 1.100 g of 238U in the rock? The half-life of 238U is t1/2 = 4.47 × 109 years.

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