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Chlorine has isotopes of 34.98 u (75.4 percent) and 36.98 u (24.6 percent). What is its average atomic mass?
A34.98 u
B36.00 u
C35.98 u
D35.47 u
Answer & Solution
Correct answer: D. 35.47 u
The weighted mean is 0.754 × 34.98 + 0.246 × 36.98, which is about 35.47 u.
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