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Question
Why is the atomic mass of chlorine taken as 35.5? [2 MARKS]
Why is the atomic mass of chlorine taken as 35.5? [2 MARKS]
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Solution
Logic : 1 Mark
Process : 1 Mark
Chlorine exists as two isotopes, Cl-35 and Cl-37. Cl-35 is 75% abundant whereas Cl-37 makes up the remaining chlorine. When we consider the atomic mass of Cl, we take the average mass of Cl atoms.
Average wt. = 0.75 x 35 + 0.25 x 37 = 35.5
Logic : 1 Mark
Process : 1 Mark
Chlorine exists as two isotopes, Cl-35 and Cl-37. Cl-35 is 75% abundant whereas Cl-37 makes up the remaining chlorine. When we consider the atomic mass of Cl, we take the average mass of Cl atoms.
Average wt. = 0.75 x 35 + 0.25 x 37 = 35.5
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