Mass (amu) Abundance(%)
151.9195 0.200153.9207 2.200154.9226 14.80155.9221 20.50x 15.70157.9241 y159.9271 21.90
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Percent should sum up to 100.
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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