Answer:
D) 8g
Explanation:
Given data:
Half life of I-131 = 8 days
Total amount of sample = 64 g
Amount remain after 24 days = ?
Solution:
Number of half lives = T elapsed / Half life
Number of half lives = 24 days / 8 days
Number of half lives = 3
At time zero = 64 g
At 1st half life = 64 g/ 2= 32 g
At second half life = 32 g /2 = 16 g
At third half life = 16 g/ 2 = 8 g
