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martinez18abdel
28.02.2020 •
Chemistry
The half-life of Erbium-165 is 10.4 hours. After 24 hours a sample has been reduced to a mass of 2 mg. What was the initial mass of the sample, and how much will remain after 3 days?
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Ответ:
Explanation:
Given that:
Half life = 10.4 hours
Where, k is rate constant
So,
The rate constant, k = 0.06664 hour⁻¹
Time = 24 hours
Using integrated rate law for first order kinetics as:
Where,
So,
Now, time = 3 days = 3*24 hours = 72 hours ( 1 day = 24 hours)
Thus,
Ответ: