Question

Gold-198 has a half-life of 2.7 days. How much of a 96g sample of gold-198 will be left after 8.1 days?

Answer 1

Since `8.1=3xx2.7` there will be three halvings:

Explanation:

`1/2xx1/2xx1/2=1/8`th will be left. This is `1/8xx96=12g`