The half life of Sodium-24 is 15 hours. How much of 100g sodium-24 would be left after 30 hours?

1 Answer
David Drayer
May 4, 2018

25 grams

Explanation:

30 hours is two half-lives

# 30/15 = 2#

In the first half life the radioactive Sodium will lose half of its mass

# 100/2 = 50# there will be 50 grams left in 15 hours

In the second half life the radioactive Sodium will have of what is left.

# 50/2 = 25 #

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