The highly radioactive isotope Tritium () possesses a known first-order half-life of . If a sealed vessel is initially loaded with precisely of pure tritium, exactly how many milligrams will remain un

Question

The highly radioactive isotope Tritium (${}^3H$) possesses a known first-order half-life of $12.3 	ext{ years}$. If a sealed vessel is initially loaded with precisely $32 	ext{ mg}$ of pure tritium, exactly how many milligrams will remain unreacted after $49.2 	ext{ years}$?

Prashant Kotian · Accepted Answer

Correct answer: C. The total number of elapsed half-lives is . Using the fractional decay formula for first-order kinetics, the amount remaining is .

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