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salantis [7]
3 years ago
14

After two half-lives, a sample contains 10 grams of parent isotopes. How many grams of the parent isotope were present to start?

Chemistry
2 answers:
Lunna [17]3 years ago
8 0
T=2T
m=10 g

m=m₀2^(-t/T)

m₀=m/{2^(-2T/T)=m/2⁻²

m₀=10/2⁻²=40 g

40 grams
almond37 [142]3 years ago
8 0
Theirs a total of 39.9999G at the start
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