CHEMWORK Rubidium-87 decays by B production to strontium-87 with a half life of 4.7 x 1010 years. What is the age of a rock sample that contains 108.0 ug 87Rb and 6.5 µg 87sr ? years old Assume that no 87Sr was present when the rock was formed. The atomic masses are given in the table below: Nuclide Atomic Mass 87RB 86.90919 87sr 86.90888 Submit

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