High School

The atomic weight of chlorine is 35.5. It has two isotopes with atomic weights of 35 and 37. What is the percentage of the heavier isotope in the sample?

Answer :

Final answer:

In a given sample of chlorine, the percentage of the heavier isotope (³7Cl) is 24.24%. This is inferred by representing the fractional presence of the isotopes in an equation and solving for each.

Explanation:

The atomic weight of Chlorine is 35.5, and it exists primarily in two isotopes, ³5Cl and ³7Cl, with atomic weights of 35 and 37 respectively. If x represents the fraction of ³5Cl, then the fraction of ³7Cl is represented by 1 - x. The solution to this equation is x= 0.7576 which implies that Chlorine consists of 75.76% ³5Cl and 24.24% ³7Cl. This showcases that in a given sample of Chlorine, 24.24% would be the heavier isotope, ³7Cl.

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