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Complete the transmutation equation shown below. Assume that there is only one unknown product. U92235→He24+?

A particular radioactive isotope has a half-life of 5.0 s. What fraction of the original amount of isotope will remain in a sample after 20.0 s?

Samarium-146 (S146m) can decay to form neodymium-142 (N142d). Each atom of S146mthat decays produces one atom of N142d and one alpha particle. If the mass of 1 mol S146mis 145.9130 g, the mass of 1 mol N142d is 141.9077 g, and the mass of 1 mol alpha particles is 4.0015 g, how much mass is lost during the decay of 1 mol S146m to N142d?