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Chemistry
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Mass (amu) Abundance(%) 

151.9195      0.200
153.9207      2.200
154.9226      14.80
155.9221      20.50
x                   15.70
157.9241      y
159.9271     21.90

Sep 30th, 2015

Thank you for the opportunity to help you with your question!

Percent should sum up to 100.

Hence 0.2+2.2+14.80+20.5+15.7+y+21.9=100

So y=24.7

So mass of element = 0.002*151.9195+0.0220*153.9207+0.1480*154.9226+.2050*155.9221+0.1570x+0.2470*157.9241+0.2190*159.9271


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Sep 30th, 2015

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