Naturally occurring iodine has an atomic mass of 126.9045 amu.
A 12.3849 g sample of iodine is accidentally contaminated with
an additional 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.
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