Reactant Half-Life
The concentration of a reactant in a first-order decomposition reaction is decreased to 1/8 of its original value in 100 s. What is the half-life of the reactant?
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Loading ...Radionuclide Half-Life
What is the half-life of a radionuclide if 1/16 of its initial mass is present after 2 hours?
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B.
In every half-life, the mass decreases to half its previous value:
1/16 = 1/24
It takes four half-lives to decay down to 1/16 the original mass. Each must be 30 minutes long since the entire process takes two hours.
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