A12.3849 -g sample of iodine is accidentally contaminated with1.00070 g of ^129 I, naturally occurring iodine has an atomic mass of 126.9045, a synthetic radioisotope of iodine used in the treatment of certain diseases of the thyroid gland. Find out the apparent "atomic mass" of the contaminated iodine? Where the mass of ^129 I is 128.9050amu.