Breathalyzers determine the alcohol content in a person's breath by the following (unbalanced) redox reaction:
C2H5OH + Cr2O72− → CH3CO2H + Cr3+ (acidic solution)
If analysis of a breath sample generates 1.70 x 10-4 M Cr3+ ions in 25.0 mL, how many mg of alcohol did it contain?
| NOTE: This is a case of balancing the chemical equation correctly, using redox reactions. Once you have the correct stoichiometric ratio between ethanol and Cr3+, as well as the molecular weight of the species, it is no further electrochemistry, just a moles-to-grams conversion. |
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Breathalyzers determine the alcohol content in a person's breath by the following (unbalanced) redox reaction: C2H5OH...
Breathalyzers determine the alcohol content in a person's breath by the following (unbalanced) redox reaction: C2H5OH + Cr2O72− → CH3CO2H + Cr3+ (acidic solution) If analysis of a breath sample generates 1.70 x 10-4 M Cr3+ ions in 25.0 mL, how many mg of alcohol did it contain? NOTE: This is a case of balancing the chemical equation correctly, using redox reactions. Once you have the correct stoichiometric ratio between ethanol and Cr3+, as well as the molecular weight of...
Breathalyzers determine the alcohol content in a person's breath by the following (unbalanced) redox reaction: C2H5OH + Cr2O72− → CH3CO2H + Cr3+ (acidic solution) If analysis of a breath sample generates 6.80 x 10-4 M Cr3+ ions in 75.0 mL, how many mg of alcohol did it contain?
Breathalyzers determine the alcohol content in a person's breath by the following (unbalanced) redox reaction: C2H5OH + Cr2O72− → CH3CO2H + Cr3+ (acidic solution) If analysis of a breath sample generates 7.60 x 10-4 M Cr3+ ions in 35.0 mL, how many mg of alcohol did it contain?
Breathalyzers determine the alcohol content in a person’s breath by a redox reaction using dichromate ions (the unbalanced reaction is shown below). C2H5OH + Cr2O72− → CH3CO2H + Cr3+ a. Determine the number of electrons transferred in this redox reaction. b. Determine the concentration (in M) of Cr3+ in 50.0mL of solution at the Canadian legal blood alcohol concentration limit (BAC, limit is 0.08 mg/mL).