Question

Radium-226, an isotope of radium, has a half-life of 1,601 years. Suppose your chemistry teacher has a 50-gram sample of radium-226. How much of the sample will be remaining after 100 years?

Answer 1

115

Explanation:

that is the answer for edge

Answer 2

we know that
Half-life is modeled by the formula
An=A0*(0.5)^[t/h)]
where
An----------> is the amount remaining after a time t
A0----------> is the initial quantity
t------------> is the time
h------------> is the half-life of the decaying quantity

in this problem
h=1601 years
A0=50 g
An=?
t=100 years
An=A0*(0.5)^[t/h)]---------> An=50*(0.5)^[100/1601)]-----> 47.88 gr

the answer is 47.88 g