ookmarks Window Help saplinglearning.com Tin Has Ten Stable lsotopes. The Heavie

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ookmarks Window Help saplinglearning.com Tin Has Ten Stable lsotopes. The Heaviest, 124Sn, Ichegg.com Kean Uni Required HW 11 4/15/2017 06:00 PM A 1112 Print LCalculator Periodic Table Question 2 of 12 Sapling Learning Tin has ten stable isotopes. The heaviest, Sn, makes up 5.80% of naturally occurring tin atoms. How many atoms of 2sn are present in 82.0 g of naturally occurring tin? atoms What is the total mass of the 'sn atoms in this sample? Previous ® Gve up 6 vvew kokakon check Answer o Next

Explanation / Answer

(1) convert the mass to moles using the atomic weight of Sn

(82.0 g)/(118.71 g/mole) = 0.6907 moles

(2) calculate the number of Sn atoms in that number of moles

(0.6907 moles)*(6.022 x 1023 atoms/mole) = 4.159 x 1023 atoms of Sn

(3) calculate the number of Sn-124 atoms in that number of atoms

(4.159 x 1023 atoms of Sn)*(5.80%/100%) = 2.412 x 1022 atoms

(4) calculate the mass of that number of atoms:

(124 g/mole)*(2.412 x 1022 atoms)/(6.022 x 1023 atoms/mole) = 4.966 g

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