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OpenStudy (anonymous):
Calculate the atomic mass of iridium. Iridium has two isotopes. Iridium-191 has a mass of 191.0 amu and a percent abundance of 37.58%. Iridium-191 has a mass of 193.0 amu and a percent abundance of 62.42%.
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OpenStudy (kl0723):
so I guess that would be 191.0*0.3758 + 193.0*0.6242 = 192.0
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