khelseafloriant4223 khelseafloriant4223

19-06-2018
Chemistry

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Iridium has two naturally occurring isotopes. Iridium-191 has a mass of 190.96 and a relative abundance of 37.3%. Iridium-193 has a mass of 192.96 and a relative abundance of 62.7%. What is the weighted average atomic mass of iridium?

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ukumer33 ukumer33

19-06-2018

Multiply the isotopes by their percentages in decimal form
190.96x.373= 71.22808
192.96x.627= 120.98592
Then just add them together
192.214 amu

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