A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. The half-life of the decay series U-238 Pb-206 is 4.5 x 10 9 yr. Assuming no Pb-206 was
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A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. The half-life of the decay series U-238 → Pb-206 is 4.5

x 109yr. Assuming no Pb-206 was present in the rock initially, how old is the rock?

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The age of the rock is the time t=... View the full answer

A=A 0 (1/2) t/h A=final mass A 0 =Initial mass t=total time... View the full answer

Since mass is conserved that means... View the full answer

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Since mass is conserved that means the initial mass of U­238 was 0.37 mg+0.95 mg=1.32 mg [A]t=[A]i*0.5^(t/t½) where [A]t=amount remaining after time t =0.95 mg [A]i=initial amount=1.32 mg...

1) Let's get the initial amount of U-238: 0.37 mg / 205.974 mg/mol = 0.00180 m mol of Pb-206 There is a 1:1 molar ratio... View the full answer

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