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How long will it take 100cm^3 of an unknown gas to diffuse out if equal...

How long will it take 100cm^3 of an unknown gas to diffuse out if equal volume of methane to diffuse out in 20secs and the ratio of the relative molar mass of the gas to that of methane is 4:1?
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Asked by Eludire on 2nd January, 2024
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