The average molar mass of chlorine is 35.5 g mol–1. The ratio of 35Cl to 37Cl in naturally occurring chlorine is close to: (A) 3 : 1 (B) 4 : 1 (C) 2 : 1 (D) 1 : 1

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Question

The average molar mass of chlorine is 35.5 g mol–1. The ratio of 35Cl to 37Cl in naturally occurring chlorine is close to:

(A) 3 : 1
(B) 4 : 1
(C) 2 : 1
(D) 1 : 1

Prashant Kotian · Accepted Answer

Correct answer: A. 35Cl 37Cl Molar ratio x 1 – x Mavg. = 35 × x + 37(1 – x) = 35.5 35x + 37 – 37x = 35.5 2x = 1.5 x = 4 So, ratio of 35Cl : 37Cl = 3 : 1

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