What is the mass of 25.0 mCi of technetium-99m (Tc_99m), which has a half-life of 6.00 h?

Question

Quizplus · Accepted Answer

The mass of a radioactive isotope can be calculated using its activity (in this case, given in millicuries, mCi) and its half-life. The specific activity of technetium-99m can be calculated using its half-life and the fact that 1 Ci = 3.7 x 10^10 disintegrations per second (dps). The mass of the isotope is then found by dividing the given activity by the specific activity and converting to mass using the molar mass of technetium-99m. The calculation involves several steps, including converting mCi to Ci, using the half-life to find the decay constant, and then calculating the mass. The correct answer, 4.74 ng, accounts for these calculations accurately, considering the physical properties of technetium-99m and the given activity.

What Is the Mass of 25