A compound that contains only carbon, hydrogen, and oxygen is 40.54% C and 5.44% H by mass. What is the empirical formula of this substance?

Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter5: Stoichiometry
Section: Chapter Questions
Problem 93E
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Answer all 3 questions and show all work.

1. A compound that contains only carbon, hydrogen, and oxygen is 40.54% C and 5.44% H by mass. What is the empirical formula of this substance?

2. Prevacid is used to treat gastroesophageal reflux disease (GERD). The chemical formula of Prevacid is C16H14F3N3O2S. What is the molar mass (in g/mol) of Prevacid? Make sure to have the correct amount of significant figures. 

3. An element consists of 1.40% of an isotope with mass 203.973 amu, 24.10% of an isotope with mass 205.9745 amu, 22.10% of an isotope with mass 206.9759 amu, and 52.40% of an isotope with mass 207.9766 amu.
Calculate the average atomic mass. Make sure to have the correct amount of significant figures. 

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