Question

Question #5ef03

Answer 1

`24g Eu`

Explanation:

If the half-life of the `Eu` nuclide is `13y`, and time given is `26y`, there are `26/13 = 2` half-lives in the time interval. That is, the mass of the `Eu` nuclides will decrease by `1/2` twice and thus decrease by a factor of `1/4`.

`1/4 xx 96g = 24g`