The half-life of Au^198 is 2.7 days. The activity of 1.50 mg of Au^198 if its atomic weight is 198 g mol^–1 is, (NA = 6 × 10^23/mol) (NA = 6 × 10^23/mol) The half-life of Au^198 is 2.7 days. The activity of 1.50 mg of Au^198 if its atomic weight is 198 g mol^–1 [...]