Uranium -238 decays in a series of steps to Pb-206. When the material is very old, one can treat the kine.cs as a decay directly to Pb and the ratio of these two can be treated as a measure of the age of a rock. A rock containing 238 U and 206Pb was examined to determine its approximate age. The molar ratio of 206pb to 238U was 0.1308. Assuming no lead was originally present and that all lead formed remained in the rock, what is the age of the rock (in years)? The half-life of 238U is 4.50e9 yr

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