Barium – 122 has a half-life of 2 minutes. Suppose you obtain a sample weighing 100.0 g and it takes 14 minutes to set up an experiment. How many grams of Barium – 122 will remain at the point when you begin the experiment? Do not enter the unit (which is understood to be "grams"). If you enter a unit explicitly (such a "g"), your answer will be counted wrong.
