Assignments Chapter19_Quiz C Chegg Search $ ChemTeam: Half-life problems X + C njit.instructure.com/courses/20816/assignments/237199 DJ Update Nuclear_Chemistry Quiz Questions.pptx Download Info X Close Page of 7 - ZOOM + Example 6 Using Uranium/Lead Dating to Estimate the Age of a Rock A meteor contains 0.556 g of Pb-206 to every 1.00 g of U-238. Assuming that the meteor did not contain any Pb-206 at the time of its formation, determine the age of the meteor. Uranium-238 decays to lead-206 with a half-life of 4.5 billion years. t1/2 k 0.693 11/2 = K Before substituting into the integrated rate law, you need the ratio of the current amount of U-238 to the original amount (N/N.). The current mass of uranium is simply 1.00 g. The initial mass includes the current mass (1.00 g) plus the mass that has decayed into lead-206, which you can determine from the current mass of Pb-206. g Pb-206 mol Pb-206 mol U-238 g U-238 1 mol Pb 206 g Pb 1 mol U 1 mol Pb 1 238 g U 1 mol U k, N, N9 t In N No = -kt