Contaminated iodine-129?

Naturally occurring iodine has an atomic mass of 126.9045. A 12.3849 g taste of iodine is accidentally contaminated with 1.00070 g of Iodine-129. The mass of iodine-129 is 128.9050 amu. Find the adjectives "atomic mass" of the contaminated iodine.

Answers:    im sorry

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