Chemistry Isotopes Solution: Naturally occurring iodine has an atomic mass of 1...

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Solution: Naturally occurring iodine has an atomic mass of 126.9045 amu. A 12.3849-g sample of iodine is accidentally contaminated with 1.00070 g of 129I, a synthetic radioisotope of iodine used in the treatment of certain diseases of the thyroid gland. The mass of 129I is 128.9050 amu.Find the apparent "atomic mass" of the contaminated iodine.