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Per NCERT Exercise 1.9, using ³⁵Cl (75.77%, mass 34.9689) and ³⁷Cl (24.23%, mass 36.9659), what is the AVERAGE ATOMIC MASS of chlorine?
AAbout 35.45 u
BExactly 36 u
CAbout 36.5 u
DExactly 35.5 u
Answer & Solution
Correct answer: A. About 35.45 u
Per NCERT Exercise 1.9, avg = 0.7577×34.9689 + 0.2423×36.9659 ≈ 35.45 u (rounded). Hence Cl in periodic table shows 35.5.
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