Two isotopes, A and B, are present in a chlorine sample with 75% and 25% abundances, respectively. Their average atomic mass is 35.5 u, and the sum of their nucleons is 72. What are the number of nucleons in A and B, respectively?
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A.
38 and 34
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B.
34 and 38
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C.
35 and 37
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D.
37 and 35
Correct Answer:
C. 35 and 37
Explanation:
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