Answered: a) 1.488×10-4 mol of an unidentified…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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a) 1.488×10^-4 mol of an unidentified gaseous substance effuses through a tiny hole in 81.2 s.
Under identical conditions, 1.945×10^-4 mol of argon gas takes 88.0 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 82.7%. It may also contain H.
What is the molecular formula of the substance?
(In typing this formula use the convention that C comes first.)

c)Under identical conditions, how many moles of allene (C₃H₄) gas would effuse in 76.6 s?

I know how to do A and B, i just need help with C.

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