Question #e76e2

1 Answer
Mike G.
Sep 11, 2014

If its 1.4% by mass, then that means there are #0.014*200.0=2.8mg# of the 214 isotope.

#2.8 mg=0.0028 g#

#0.0028/214=1.31*10^(-5) mol#
#2.8# mg of lead-214 is therefore #1.31*10^(-5)# mol

#1.31*10^(-5)*6.02*10^(23)=7.9*10^18# atoms
#1.31*10^(-5)# mol of a substance therefore contains #7.9*10^18# atoms.

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