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Question: a 2247104 mol of an unidentified gaseous substance effuses through...

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a) 2.247×10-4 mol of an unidentified gaseous substance effuses through a tiny hole in 96.0 s. Under identical conditions, 1.637×10-4 mol of argon gas takes 83.5 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 42.9%. 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.)
c) Under identical conditions, how many moles of ethylene oxide (C2H4O) gas would effuse in 86.2 s?

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