A certain compound contains 40.0% carbon, 6.71% hydrogen, and 53.3% oxygen by mass. If a 0.320-mole sample weighs 28.8 g, what is the molecular formula of this compound? Your answer (Enter 1 if the subscript is 1): C H

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter3: Chemical Reactions
Section3.9: Composition And Empirical Formulas
Problem 3.21CE: Phenol is a compound of carbon, hydrogen, and oxygen used commonly as a disinfectant. Combustion of...
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A certain compound contains 40.0% carbon, 6.71% hydrogen, and 53.3% oxygen by mass. If a 0.320-mole sample weighs 28.8 g, what is the molecular formula of this
compound?
Your answer (Enter 1 if the subscript is 1):
C H
Give the empirical formula of an oxide of lead that contains 90.65% Pb.
Your answer (Enter 1 if the subscript is 1):
Pb 0
If a sample of urea, CH4N₂O, is 84% pure, what is the percent by mass of nitrogen in this sample assuming that there is no nitrogen in the impurities?
Your answer:
Transcribed Image Text:A certain compound contains 40.0% carbon, 6.71% hydrogen, and 53.3% oxygen by mass. If a 0.320-mole sample weighs 28.8 g, what is the molecular formula of this compound? Your answer (Enter 1 if the subscript is 1): C H Give the empirical formula of an oxide of lead that contains 90.65% Pb. Your answer (Enter 1 if the subscript is 1): Pb 0 If a sample of urea, CH4N₂O, is 84% pure, what is the percent by mass of nitrogen in this sample assuming that there is no nitrogen in the impurities? Your answer:
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