One mole of a radioactive nuclide A is placed in a closed vessel and undergoes decay via the reaction: . If the half-life of A is , what total volume of Helium gas (in Litres) is collected at NTP afte

Question

One mole of a radioactive nuclide A is placed in a closed vessel and undergoes decay via the reaction: ${}_{Z}^{A}A ightarrow {}_{Z-4}^{A-8}B + 2{}_{2}^{4}He$. If the half-life of A is $10	ext{ days}$, what total volume of Helium gas (in Litres) is collected at NTP after exactly $20	ext{ days}$? (Assume ideal behavior, $1	ext{ mol gas at NTP} = 22.4	ext{ L}$).

Prashant Kotian · Accepted Answer

Correct answer: C. 20 days = 2 half-lives. Fraction of A remaining = . Fraction decayed = . Reaction stoichiometry shows yields . Total He produced = . Volume = .

💡 Solution & Explanation

Practice 22,000+ questions like this