Dimpalk104
  • Dimpalk104
Suppose the isotopic ratio of the two boron isotopes 10B (10.013 amu) and 11B (11.009 amu) in a sample has been altered from the ratio found in nature and now contains 18.67% 10B in the sample. Determine the atomic weight of this sample of this new boron element.
Chemistry
jamiebookeater
  • jamiebookeater
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zpupster
  • zpupster
(0.1876 * 10.013) + ((1 - 0.1876) * 11.009)) taking the known percent and multiply by 10b subtract from 100 percent(or 1) to get remaining percent and multiply by 11B
Rushwr
  • Rushwr
Simply when we have 2 types of isotopes the total abundance of both the elements should be equal to 100% If you have 18.67% of 10B then you will have (100-18.67%) of 11B So you have 81.33% of 11B. \[a.m.u. = \frac{ (18.67 * 10.013) + (81.33 * 11.009) }{ 100 }= 10.823\]

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