🤓 Based on our data, we think this question is relevant for Professor Alghoul's class at GSU.

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

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:

**t**_{1/2} = half-life

**k** = decay constant

First Order Half Life

First Order Half Life

First Order Half Life

First Order Half Life