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Naturally occurring iodine has an atomic mass of 126.9045 amu. A 7.57 g sample of iodine was found to be contaminated with I-129, a synthetic radioisotope of iodine used in the treatment of certain diseases of the thyroid gland. The mass of the isotope, I-129, is 128.905 amu while the atomic mass of the contaminated iodine sample is 127.1982 amu. What is the mass of the contaminant?

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