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Chlorine is 75.77% Cl-35 (34.97 u) and 24.23% Cl-37 (36.97 u). Its average atomic mass is about:
A35.45 u
B35.97 u
C36.00 u
D35.00 u
Answer & Solution
Correct answer: A. 35.45 u
Weighting by abundance gives 0.7577 x 34.97 + 0.2423 x 36.97, which is about 26.50 + 8.96 = 35.45 u.
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