There is 1 gram of radioactive cobalt. How many grams of cobalt decays in 216 days if its half-life is 72 days?
| September 18, 2021 | education
Every 72 days, the amount of cobalt is halved.
216/72 = 3;
That is, in 216 days, the number of cobalt atoms will decrease by:
2 ^ 3 = 8 times.
1/8 = 0.125 g is the mass of the remaining cobalt;
1 – 0.125 = 0.875 is the mass of decayed cobalt.
Answer: 0.875 g.
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