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xy J. Jacksonville University-CHEN × 2. www.saplinglearning.com/bis x , tg me Han- 4656106 g.com/ibiscms/mod/ibis/view.php?id Jump to 4/1/2018 11:55 PM 4 42.1/100 4/1/2018 03:50 AM ?Print caculator sal Periodic Table Question 11 of 21 Sapling Learning half-lives of different radioisotopes are given in the table below. If the initial amount of lead-196 Radioisotope Half-ife (min) argon-44 lead-196 potassium-44 12 37 indium-11743 Number 2.36 There is a hint available! View the hint bottom divider dvider bar again to hide the hint. on the Close Hint Previous Give Up&View; Solution Check Answer Next

Explanation / Answer

half - life of Pb = 37 min

rate constant = k = 0.693 / t1/2

                      = 0.693 / 37

                      = 0.0187 min-1

initiial amount = Ao = 6.4 g

k = 1/t ln (Ao / At)

0.0187 = 1 / 74 (6.4 / At)

At = 1.60

mass of lead left = 1.6 g

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