A Sample Contains 2.2 G Of The Radioisotope Niobium-91 And 15.4 G Of Its Daughter Isotope, Zirconium-91. How Many Half-Lives Have Passed Since The Sample Originally Formed? Half-Lives. Click here to get an answer to your question: Amount remaining (n) = 2.2 g.
Click here to get an answer to your question: Amount remaining (n) = 2.2 g. Original amount (n₀) = 15.4 + 2.2 = 17.6 g.