Radium-226 has a half-life of 1.62 x 10 tho the power of 3 years.?

If you have a 40.2 g sample of RN-226 how much will be left after..1620 years..810 years and 405 years?

Answer:
answer is pretty simple, half lives mean what they say. after 1620 years you'll have half of what you started, or 20.1 g. 810 years is 1/2 x 1/2 or 1/4, meaning you'd have 3/4 of what you began with, or 40.2 x 3/4= 30.15g. 405 years is 1/8 of the half life 40.2 x 7/8 = 35.175g.
Hope this helps
after 1620 years 20.1 gms will be left

as 1620 is the half life period of it


after 810 years 30.15 gms


and after 405 years 35.175 gms
trick question!
yes after one half life there is 40.2/2 g left = 20.1 g
but after 810 years (half a half-life) there is 28.426 g left

40.2 * exp(-ln(2)*time/1620)

so after 405 years there is 33.804 g left

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