Question

Barium-122 has a half-life of 2 minutes. If 10.0 g of Ba-122 are produced in a nuclear reactor how much Ba-122 will remain 10 minutes after production ceases?

Question 11 options:

2.50 g


1.25 g


0.625 g


0.313 g

Answer 1

10 min/2 min half life = 5
So it has gone through 5 half lives.
2^5 = 32
10g initially/32 = ? what's left.

Answer 2

0.313g