Question 1
The I-131 nuclide has a half-life of 8.0 days. If you originally have a 1.8-kg sample, after 1.4 months you will have approximately
◦ 95 g
◦ 62 g
◦ 71 g
◦ 47 g
◦ less than 1 g
Question 2
The magnesium-24 nucleus has a binding energy per nucleon of 8.059 MeV. (1 MeV is 1.60 × 10–13 J).
Determine the difference in mass between one mole of magnesium-24 nuclei and the component nucleons of which it is made.
◦ 2.07 × 10–4 kg
◦ 3.60 × 10–7 kg
◦ 8.64 × 10–6 kg
◦ 3.09 × 10–11 kg
◦ 1.04 × 10–4 kg