Print CalculatorPeriodic Table 12 Incorrect IncorrectIncorrect Sapling Learning

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Print CalculatorPeriodic Table 12 Incorrect IncorrectIncorrect Sapling Learning Map Tin has ten stable isotopes. The heaviest, zen, makes up 5.80% of naturally occuring tin atoms. How many atoms of 124Sn are present in 89.0 g of naturally occurring tin? Number 262 × 1022 atoms What is the total mass of the 24Sn atoms in this sample? enorrect. 124Sn makes up 5 80% or the atoms present in naturally occurring tin, not 5 80% of the mass. Number 5.162 To find the mass orogn equal to the percentage of atoms in the sample. convert thermass of the sample to the number of moles in an average mass of tin. Next, convert from moles of the whole sample to rnales or asn present (5.80% of the moles in the sample are Sn). Finally, convert moles of 124Sn mass of cuSn Remember, isotopes have different masses per one mole ..O Prervous ® Gia' Up & View Solution Try Again O Next Exit

Explanation / Answer

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

(89.0 g) / (118.71 g/mole) = 0.7494 moles

(atomic weight of Sn from = 118.71 g/mole)

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

(0.7494 moles) x (6.023 x 1023 atoms/mole) = 4.514 x 1023 atoms of Sn

(Avogadro's number = 6.023 x 1023 atoms/mole)

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

5.8% of (4.514 x 1023 atoms of Sn)

(4.514 x 1023 atoms of Sn) x (5.80 / 100) = 2.62 x 1022 atoms (three sig figs)

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

[ (124 g/mole) x (2.62 x 1022 atoms) ] / (6.023 x 1023 atoms/mole)

= 5.39 g

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