Strontium-90 is a dangerous by-product of atomic testing because it mimics the action of calcium in the body. It decay in two β-emissions to give zirconium-90 (nuclear mass = 89.8824 g). a) Write a balanced nuclear equation for the overall decay of Sr-90. b) Calculate Δm in grams when one mole of Sr-90 decays to Zr-90. c) How much energy (in KJ) is given off by the decay of 6.50 mg of Sr-90?

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.