Problem: When a 2.50 g sample of cobalt-60 is stored for 10 years, 0.669 g remain. What is the half-life of cobalt-60? a) 26.3 yb) 12.1 yc) 11.5 yd) 2.59 ye) 5.25 y 

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We’re being asked to determine the half-life of cobalt–60


Recall that half-life is the time needed for the amount of a reactant to decrease by 50% or one-half


The half-life of a first-order reaction is given by:



where:

t1/2 = half-life

k = decay constant


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Problem Details

When a 2.50 g sample of cobalt-60 is stored for 10 years, 0.669 g remain. What is the half-life of cobalt-60?

a) 26.3 y

b) 12.1 y

c) 11.5 y

d) 2.59 y

e) 5.25 y 

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