180 mL of hydrocarbon takes 15 min to diffuse. Under the same conditions 120 mL of sulphur dioxide (mol. Wt 64) takes 20 min. The molecular weight of the hydrocarbon is

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180 mL of hydrocarbon takes 15 min to diffuse. Under the same conditions 120 mL of sulphur dioxide (mol. Wt 64) takes 20 min. The molecular weight of the hydrocarbon is