If the density of gas X is double the density of gas Y, and the molecular weight of gas Y is M, what is the molecular weight of gas X?

CHEMICAL ENGINEERING MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
CHEMICAL ENGINEERINGchemical-engineering
Published
12 Mar 2019
Last updated
28 May 2026

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Explanation

Since density is directly proportional to molecular weight for gases under the same conditions, if gas X has twice the density of gas Y, its molecular weight must be twice that of gas Y. Therefore, the molecular weight of gas X is 2M.

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