The iodine has an atomic mass of 126.9045 in naturally occurring. A sample of iodine is having12.2849-g accidentally contaminated with 1.00070g of ^129I, a synthetic radioisotope of iodine used in the treatment of certain diseases of the thyroid gland. Given the mass of ^129I is 128.9050 amu. Calculate the apparent "atomic mass" of the contaminated iodine.