A volatile hydrocarbon (a binary compound of carbon and hydrogen) was determined to be 92.3 % carbon, by mass. In a separate experiment, utilizing the Dumas method, 4.00 mL pure liquid sample of this hydrocarbon is vaporized in an Erlenmeyer flask when the barometric pressure is 768.0 torr. The empty flask was fitted with a foil cap pierced with a pinhole and weighed 25.3478 g. After the excess gas escaped, the temperature was measured as 98.0 °C. The flask and contents were subsequently cooled to 25 °C and the vapor condensed into a liquid. The weight of the flask and contents is found to be 25.6803 g. The exact volume of the flask was determined to be 128.5 mL. Using this information, determine both the empirical and molecular formula of this hydrocarbon. Show/explain the steps of your work.
A volatile hydrocarbon (a binary compound of carbon and hydrogen) was determined to be 92.3 % carbon, by mass. In a separate experiment, utilizing the Dumas method, 4.00 mL pure liquid sample of this hydrocarbon is vaporized in an Erlenmeyer flask when the barometric pressure is 768.0 torr. The empty flask was fitted with a foil cap pierced with a pinhole and weighed 25.3478 g. After the excess gas escaped, the temperature was measured as 98.0 °C. The flask and contents were subsequently cooled to 25 °C and the vapor condensed into a liquid. The weight of the flask and contents is found to be 25.6803 g. The exact volume of the flask was determined to be 128.5 mL. Using this information, determine both the empirical and molecular formula of this hydrocarbon. Show/explain the steps of your work.
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter10: Solids, Liquids, And Phase Transitions
Section: Chapter Questions
Problem 64AP
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A volatile hydrocarbon (a binary compound of carbon and hydrogen) was determined to be 92.3 % carbon, by mass. In a separate experiment, utilizing the Dumas method, 4.00 mL pure liquid sample of this hydrocarbon is vaporized in an Erlenmeyer flask when the barometric pressure is 768.0 torr.
The empty flask was fitted with a foil cap pierced with a pinhole and weighed 25.3478 g. After the excess gas escaped, the temperature was measured as 98.0 °C. The flask and contents were subsequently cooled to 25 °C and the vapor condensed into a liquid. The weight of the flask and contents is found to be 25.6803 g. The exact volume of the flask was determined to be 128.5 mL.
Using this information, determine both the empirical and molecular formula of this hydrocarbon. Show/explain the steps of your work.
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