The atomic weight of is 35.45 amu. There are only two naturally occurring isotopes of chlorine: , with a weight of 35.0 amu, and , with a weight of 37.0 amu. The natural abundance of the isotope is approximately:__________.
The natural abundance of the 35.0 amu isotope is 77.5%, and the natural abundance of the 37.0 amu is 22.5%
Explanation:
The atomic weight of an element is the weighted average between each of the weight of isotopes.
Then the natural abundance of 35.m amu isotope would be x, and for the other would be 1-x.
According to the definition of the atomic weight for this case: [tex]x*35+(1-x)*37=35.45[/tex], then solving for x, it is obtain that the fraction for 35 amu isotope is 0.775 (77.5%), and for 37 uma isotope is 0.225 (22.5%).
