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If 40 G of Substance of Half-Life 5

Question 11

Multiple Choice

If 40 g of substance of half-life 5.0 hours remain from an original sample of 1.28 kg, the time that has passed is

A) 1.0 hour.
B) 20 hours.
C) 25 hours.
D) 80 hours.
E) 160 hours.

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