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A sample of SCl6(g) is used in an effusion apparatus and 25.0 torr effuses through a tiny hole in 54.0 minutes. An Unknown gas is

A sample of SCl6(g) is used in an effusion apparatus and 25.0 torr effuses through a tiny hole in 54.0 minutes. An Unknown gas is used in the same apparatus and it takes 18.0 minutes to effuse 25.0 torr under the same conditions? What is the Molar Mass of the Unknown gas in g/mol ? (Hint: Heavier takes a longer time) - SCl6(g)=244.8g/mol

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