A breathalyzer instrument contains two ampules each of

Assignment Help Chemistry

Reference no: EM13640129

(BAC) is often reported in weight-volume percent (w/v%). For example, a BAC of 0.08% corresponds to 0.08 g CH3CH2OH per 100 mL of blood. In Ontario, and the rest of Canada, the maximum legal BAC for fully licensed drivers is 0.08%. Estimates of BAC can be obtained from breath samples using a number of commercially available instruments, including "The Breathalyzer". The original Breathalyzer instrument was based on the following oxidation-reduction reaction.

Balance the equation:
CH3CH2OH(aq) + Cr2O72(aq) ------> CH3COOH(aq) + Cr3+(aq)
acid solution

ethyl alcohol (yellow-orange) acetic acid (green)

A Breathalyzer instrument contains two ampules, each of which contains 0.75 mg K2Cr2O7 dissolved in 3 mL of 9 mol L 1 H2SO4(aq). One of the ampules is used as reference. When a person exhales into the tube of the Breathalyzer, the breath is directed into one of the ampules, and ethyl alcohol (CH3CH2OH) in the breath converts Cr2O72 into Cr3+. The instrument compares the colours of the solutions in the two ampules to estimate the blood alcohol content. The estimate of the BAC rests upon the assumption that 2100 mL of air exhaled from the lungs contains the same amount of alcohol as one millilitre of blood.

The Breathalyzer instrument typically tests 52.5 mL of exhaled breath.

(a) If the test of such a breath sample yields a reading of 0.08%, what are the partial pressure and mole fraction of CH3CH2OH in the breath of the person who was tested? Assume the atmospheric pressure and temperature are 101 kPa and 21.0 oC, respectively

Reference no: EM13640129

Questions Cloud

A wave moves on a string with wavelength lambda and : a wave moves on a string with wavelength lambda and frequency f. a second wave on the same string has wavelength

Knowing that the tank has an outer diameter of 320 mm and a : a cylindrical storage tank contains liquefied propane under a pressure of 1.5 mpa at a temperature of 388c. knowing

Methane enters a heat exchanger at a volumetric flow rate : methane enters a heat exchanger at a volumetric flow rate of 120.0 m3min at a pressure of 1.013 bar and temperature of

A near-sighted person might correct his vision by wearing : a near-sighted person might correct his vision by wearing diverging lenses with focal length 55 cm. when wearing his

A breathalyzer instrument contains two ampules each of : bac is often reported in weight-volume percent wv. for example a bac of 0.08 corresponds to 0.08 g ch3ch2oh per 100 ml

Calculate the following the pressure of carbon dioxide at : during calcination of limestone calcium carbonate is decomposed into lime and carbon dioxide. the rate of calcination

Suppose two different states each pick a two-digit lottery : suppose two different states each pick a two-digit lottery number between 00 and 99 for a 100 possible numbers. what is

A standard 52-card deck is shuffled and 5 cards are picked : a standard 52-card deck is shuffled and 5 cards are picked without replacement from the top of the deck. the

Two point charges are on the y-axis a 50 microc charge is : two point charges are on the y-axis. a 5.0 microc charge is located at y 1.10 cm and a -2.00 microc charge is located

User Account

All Pages