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Which of the following best describes the definition of half-life?
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15. Chemical Kinetics
Half-Life
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Sodium-24 has a half-life of 15 hours. How many half-lives will pass in 5 days?
A
12
B
8
C
4
D
6
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Identify the half-life of Sodium-24, which is given as 15 hours.
Convert the total time period from days to hours to match the units of the half-life. Since 1 day = 24 hours, multiply 5 days by 24 hours/day to get the total time in hours.
Use the formula to find the number of half-lives passed: Number of half-lives = Total time elapsed / Half-life duration.
Substitute the values: Number of half-lives = (5 days × 24 hours/day) / 15 hours.
Simplify the expression to find how many half-lives occur in 5 days.
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