oluepul | @htelp Sapling LearningUniverity o Sauth Florida-CHM 2046-Summer 16-ER

Question

oluepul | @htelp Sapling LearningUniverity o Sauth Florida-CHM 2046-Summer 16-ERDA Activits and Due Dales Chapler 18 and 19 My Assignment r Attempts Score /4/2016 1130PM15/20 07/3/2016 06:26 AM Awaable 23201608.00 AM Due Date: /4/2016 11 30 PM Poisible: Categery Pock 16Ri Print Calculator Periodic Table Question 16 of 16 Incorrect can check your w solutions af complete the ansignment Sapling Learning macmillan learning Thwre is no penalty for irorc Help Wth This Topc Web Help&Videos; Technical Support and Bug 32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 95.9 g of 32P, how much 3P was present 6.00 days ago? uports 32 Number $ Previous Check Answer e Next Exit Submit Assignment Y Hint 2011-2016 Saping ! Learnin Ic-

Explanation / Answer

4 days / 14.3 days = 0.4195 (that's how many half-lives have elapsed in 4 days)

(1/2)^0.4195 = 0.7476(that's the decimal amount that remains after 0.27972 half-lives have elapsed)

95.9 is to 0.7476 as x is to 1

x = 128.277 g

rounded to three sig figs, 128 g

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