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Please can someone solve this question for me. If 140cm^3 of hydrogen diffuses in 10sec,...

Please can someone solve this question for me.
If 140cm^3 of hydrogen diffuses in 10sec, how long will it take for 420cm^3 of a gas T whose vapour density is 36, to diffuse under the same condition? (RMM of hydrogen is 2)
(A) 30sec
(B) 180sec
(C) 1080sec
(D) 1.99sec?

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