Technetium-99m (the m signifies a “metastable,” or moderately stable, species) is generated in nuclear reactors and shipped to hospitals for use in medical imaging. The radioisotope has a half-life of 6.01 h. If a sample of technetium-99m of mass 165 mg is shipped from a nuclear reactor to a hospital 125 km away in a truck that averages 50.0 km · h^–1, what mass of technetium- 99m will remain when it arrives at the hospital?