Homework Help: chemistry

Posted by Mely on Wednesday, September 8, 2010 at 9:49am.

Naturally occurring iodine has an atomic mass of 126.9045. A 12.3849 -g sample of iodine is accidentally contaminated with 1.00070 g of ^129 I, a synthetic radioisotope of iodine used in the treatment of certain diseases of the thyroid gland. The mass of ^129 I is 128.9050amu.

Find the apparent "atomic mass" of the contaminated iodine.

chemistry - bobpursley, Wednesday, September 8, 2010 at 10:13am
avg atomic mass=
1.00070*128.9050 +(12.3849-1.00070)126.9045
chemistry - bobpursley, Wednesday, September 8, 2010 at 10:14am
oops, all that has to be divided by the total mass, 12.3849 g
chemistry - ,n, Wednesday, September 14, 2011 at 9:38pm
567.0
chemistry - n00b, Friday, July 13, 2012 at 10:44pm
127.055 amu
chemistry - El Lobo Negro, Tuesday, February 12, 2013 at 6:27pm
127.055 amu

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