Ask Question
18 April, 15:20

What percentage of a radioactive substance remains after two half-lives?

+2
Answers (2)
  1. 18 April, 17:32
    0
    25%

    I know this because i have a doctorates in Percents
  2. 18 April, 18:11
    0
    Answer: 25%.

    Explanation:

    The decay of a radioactive substance obeys the rules of first order reaction. In first order reaction half life time (t1/2) is constant and does not depend on the initial concentration of the substance (t1/2 = 0.693/k) where k is the rate constant. Half-life time (t1/2) is the time needed for the reaction that the initial concentration of the reactant (substance) reaches its half (reaction be completed by 50 %). radioactive substance (100%) (first half life) → 50 % (second half life) → 25 % Hence, the radioactive substance will reach 25 % of its concentration after two half-lives.
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “What percentage of a radioactive substance remains after two half-lives? ...” in 📙 Chemistry if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers