Answer :
The mass of the original iridium-192 that remains after 105,105 days is 1.50 g.
How much iridium-192 is left after 105,105 days?
Iridium-192 is a radioactive isotope with a half-life of approximately 73.83 days. In radioactive decay, the amount of a substance decreases exponentially over time. Using the half-life formula, we can calculate the remaining mass.
After 73.83 days, half of the initial sample would decay, leaving us with 3.00 g. After another 73.83 days (totaling 147.66 days), half of the remaining 3.00 g would decay, resulting in 1.50 g. This process continues until 105,105 days, at which point the remaining mass of iridium-192 is 1.50 g.
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