Chorine 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 approximately

Question

Chorine 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 approximately, 1:2, 1:1, 1:3, 3:1

MARKS App · Accepted Answer

Let relative abundance of C l - 37 = x % then relative abundance of C l - 35 = ( 100 - x ) % Average atomic mass = x × 37 + ( 100 - x ) 35 100 35.5 37 x + 3500 - 35 x = 3550 x = 25 So 100 - x = 75 Thus, the ratio of Cl-37 and Cl-35 is x : ( 100 - x ) = 25 : 75 1:3

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