Answered: The chemical method of analysis in…

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter4: Stoichiometry

Section: Chapter Questions

Problem 4.98PAE

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Question

The chemical method of analysis in determination of the blood alcohol content (%BAC) is:

K₂Cr₂O₇ + H₂SO₄ + C₂H₅OH → Cr₂(SO₄)₃ + K₂SO₄ + CH₃COOH + H₂O

What are the stoichiometric coefficients for the reaction above? (please enter the coefficients without spaces and with a coma between the numbers, e.g. 1,2,3,4)

2,8,3,2,2,3,11

During a Breathalyzer Test it was determined that 1.75mg of K₂Cr₂O₇ was consumed by the above reaction. Calculate the number of milligrams of ethanol in the test sample.

0.411

Calculate the Blood Alcohol Content in this sample (%BAC).

Definition Definition Number that is expressed before molecules, ions, and atoms such that it balances out the number of components present on either section of the equation in a chemical reaction. Stoichiometric coefficients can be a fraction or a whole number and are useful in determining the mole ratio among the reactants and products. In any equalized chemical equation, the number of components on either side of the equation will be the same.

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