jdkdodos9590 jdkdodos9590 25-07-2024 Chemistry Answered The atomic mass of ₁₉⁴⁰K is 39.96399 u and its half-life is 1.248 × 10⁹ years. If a sample exhibits 2.4 × 10⁵ decays per second, find the mass of the sample. Avogadro's number is 6.02 × 10²³.