# The vapour density of gas A is thrice that of the gas B. If the molecular weight of B is M, then calculate the molecular weight of A.

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The vapour density of gas A is thrice that of the gas B. If the molecular weight of B is M, then calculate the molecular weight of A.

(1) M

(2) 3 M

(3) M/3

(4) None of these

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Correct Answer is: (2) 3 M