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A 138110-4 mol of an unidentified gaseous substance effuses

(a) 1.381×10^-4 mol of an unidentified gaseous substance effuses through a tiny hole in 89.2 s.

Under identical conditions, 1.710×10^-4 mol of argon gas takes 82.2 s to effuse.

What is the molar mass of the unidentified substance (in g/mol)?

(b) The percentage C by mass in the above unidentified substance is 83.2%. It may also contain H and/or O, but no other element.

What is the molecular formula of the substance?

(In typing this formula use the convention of C first, H second and O last. For example, C₆H₈O₂ would be C6H8O2.)

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Chemistry: A 138110-4 mol of an unidentified gaseous substance effuses

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