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Chlorine exists in two isotopic forms `Cl-37` and Cl-35 but its atomic mass is 35.5. this indicates the ratio of Cl-37 and Cl-35 is appromimately
A. `1:2`
B. `1:1`
C. `1:3`
D. `3:1`

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Best answer
Correct Answer - C
Avg. at. wt `=(sum% "abundance" xx "Atomic weight")/("Totalratio")`

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