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Calculate the average atomic mass of neon from the following data. The element neon...

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spock2 | Student, Undergraduate | Honors

Posted June 27, 2012 at 1:33 PM via web

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Calculate the average atomic mass of neon from the following data. 

The element neon consists of 3 isotopes with masses 19.92, 20.99, and 21.99 amu. The relative abundance of these 3 isotopes are 90.92, 0.25, and 8.83 percent, respectively.

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted June 27, 2012 at 3:27 PM (Answer #1)

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Neon consists of 3 isotopes with masses 19.92, 20.99, and 21.99 amu. The relative abundance of these 3 isotopes is 90.92, 0.25, and 8.83 percent, respectively.

The average atomic mass of neon is the weighted average of the mass of the isotopes and equal to 19.92*0.9092 + 20.99*0.0025 + 21.99*0.0883 = 20.10

The average atomic mass of neon is 20.10 amu

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