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?

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?
What is the half-life of a radionuclide if 1/16 of its initial mass is present after 2 hours?
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