10.00 points Ch. Ex. 61 Calculate Time (in years) For Sr-90 Sample to be Reduced

Question

10.00 points Ch. Ex. 61 Calculate Time (in years) For Sr-90 Sample to be Reduced by Decay 1 out of 3 attempts Enter your answer in the provided box Assistance Check My Work View Hint View Question Show Me Guided Solution Practice This Question Print Question Help Report a Problem Strontium-90 is one of the products of the fission of uranium-235. This strontium isotope is radioactive, with a half-life of 28.1 years. Calculate how long (in years) it will take for 5.08 g of the isotope to be reduced to 0.473 g by decay. yr

Explanation / Answer

K   = 0.693/t1/2

t1/2   = 28.1years

K   = 0.693/28.1   = 0.0246year^-1

[A0]   = 5.08g

[A]   = 0.473g

K   = 2.303/t log[A0]/[A]

t    = 2.303/k log[A0]/[A]

     = 2.303/0.0246 log5.08/0.473

= 93.62*1.031   = 96.52years >>>>answer

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