First slide

Kinetics of nuclear reactions or nuclear chemistry

Question

The half-life of nickel- 65 is 2.5 days. How much of a 100.00 g sample has decayed after 7.5 days?

Moderate

A

12.5 g
B

50.0 g
C

75.0 g
D

87.5 g

Solution

$Amount left = N_{0} {(\frac{1}{2})}^{n} = 100 {(\frac{1}{2})}^{3} = 12 .5 %$
$Amount decayed = 100 - 12 .5 = 87 .5 %$

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