contestada

I WILL GIVE BRAINLIEST

If a 46 gram sample of a radioisotope, Lead - 189 has a half life of 20 days then how many grams of the sample will remain after 60 days?

Respuesta :

superman1987

Answer:

5.75 g.

Explanation:

  • It is known that the decay of isotopes of Pb-189 obeys first order kinetics.
  • Also, it is clear that in first order decay the half-life time is independent of the initial concentration.
  • The half life time of Pb-189 decay = 20 days.
  • Thus, 60 hours represent (60/20) 3 half-lives.

∴ 46 g →(first half-life) 23 g →(second half-life) 11.5 g →(third half-life) 5.75 g.

  • So, The amount remained is 5.75 g after 3 half-lives (60 days).

Otras preguntas