The atomic weight of a newly discovered element is 10.600 amu. It has two naturally occurring isotopes. One has a mass of 10.000 amu and a natural abundance of 70.000%. What is the isotopic mass of the other isotope?

Md Ariful Islam

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Md Ariful Islam

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So, $10.600 (mass$ $units) = 70%xx10.000 + 30%xxM_2;$ where $M_2$ is the isoptopic mass of the other isotope.

So solve for $M_2$! A priori would you expect $M_2$ to be larger or smaller than the mass of of the other isotope; why?

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