The element chlorine (cl) has two isotopes: chlorine‑35 and chlorine‑37. approximately 75.5% of chlorine atoms have 18 neutrons and 17 protons, and the other 24.5% have 20 neutrons and 17 protons. using the isotopic composition provided, calculate the average atomic mass of chlorine. round your answer to the tenths place.

35.5 amu is the average atomic mass of chlorine

Explanation:

Fractional abundance of chlorine‑35 = 75.5%

Fractional abundance of chlorine‑37 = 24.5%

Average atomic mass is equal to summation of products of all isotopes masses into their fractional abundance.

Average atomic mass =  Σ(Mass of an isotope × fractional abundance)

Average atomic of chlorine :

35.5 amu is the average atomic mass of chlorine

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