What is the mass of a 3.90-?Ci 146C source? The half-life of 146C is 5730 yr....
What is the mass of a 3.90-?Ci 146C source? The half-life of 146C is 5730 yr.
Express your answer to three significant figures and include the appropriate units.
please help. I have no idea what im doing on this.
Homework Answers
activity, A=3.9*10^-6 Ci
A=3.9*10^-6*(3.7*10^10)
A=1.443*10^5 decays/sec
use,
no of atoms,
N=A*t1/2/(ln(2))
N=1.443*10^5*5730*365*24*60*60/(ln(2))
=3.762*10^16
mass of the atom, m=N/NA
=3.762*10^16/(6.02*10^23)
=6.25*10^-8 kg
total mass, M=14*6.25*10^-8
M=8.75*10^-7 kg
or
M=8.78*10^-4 g
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