Question

Samarium-146 has a half-life of 103. 5 million years. After 1. 035 billion years, how much samarium-146 will remain from a 205-g sample? 0. 200 g 0. 400 g 20. 5 g 103 g.

Answer 1

1.0.200g

Sample= 205g
Half-life= 103.5 millions years
Time= 1.035 billion years= 1035 million years

205g ———> 0.2001953g≈ 0.200g