A friend asks you to help her find the percentcomposition by mass of ethane (C,H). She saysthat she's been getting a percent composition of33.33% C and 66.67% H. Do you agree withher? Why or why not?O No, because the empirical formula cannot becalculated from the molecular formula.O Yes, because reducing the subscripts gives a1:3 ratio of carbon to hydrogen.Yes, because you must use the empiricalformula to find percent by mass.No, because you need to use the mass of thewhole molecule to find percent composition.

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A friend asks you to help her find the percent composition by mass of ethane (C,H). She says that she's been getting a percent composition of 33.33% C and 66.67% H. Do you agree with her? Why or why not?

A friend asks you to help her find the percent composition by mass of ethane (C,H). She says that she's been getting a percent composition of 33.33% C and 66.67% H. Do you agree with her? Why or why not?

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter11: Stoichiometry

Section: Chapter Questions

Problem 115A

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Concept explainers

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.

Question

A friend asks you to help her find the percent
composition by mass of ethane (C,H). She says
that she's been getting a percent composition of
33.33% C and 66.67% H. Do you agree with
her? Why or why not?
O No, because the empirical formula cannot be
calculated from the molecular formula.
O Yes, because reducing the subscripts gives a
1:3 ratio of carbon to hydrogen.
Yes, because you must use the empirical
formula to find percent by mass.
No, because you need to use the mass of the
whole molecule to find percent composition.

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