A laboratory investigation shows that a sample of uranium ore contains 6.82 mg of 325U (molar 92 mass 238.05079 g/mol) and 3.06

Question

A laboratory investigation shows that a sample of uranium ore contains 6.82 mg of 325U (molar 92 mass 238.05079 g/mol) and 3.06 mg of 29 Pb (molar mass 205.97447 g/mol). Calculate the age of the ore. The half-life of 33 U is 4.5×109 yr.

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