Question

A breathalyzer is a device used to estimate the blood alcohol content of a suspected drunk driver by measuring the amount of alcohol in one's breath. The fuel cell breathalyzer employs the reaction below: CH2CH2OH(s)+O2(g) --HCH,O,(g)+H2O(g) When a suspected drunk driver blows his or her breath through the fuel cell breathalyzer. the device measures the current produced by the reaction and calculates the percent alcohol in the breath When a suspected drunk driver blows 208 mL of his breath through the fuel cell breathalyzer, the breathalyzer produces an average of 344 mA of current for 13 s. Assuming a pressure of 1.0 atm and a temperature of 25 C. what percent (by volume) of the driver's breath is ethanol? (Hint: convert to volume using the ideal gas law) Express your answer as a percentage using three significant figures.

Answer 1

Heduced -2 Hy0 0OH+ CyCH OH oxidsed ethanol ws up 2 eldiko Mole PrOces M this t 34L mA 12 244x 13 x103 Axs 4.442 e 19 t.GK10 C C O 4.411 1.6 10-19 TP e Nole e -1 23

4.6Lx10 Moles mole ethanol 2 male Wses e . 1 mole ethanol 2mole 4.641 Y10S e 4.6 41XID 2 mde e 2.3205I ole ettanpl ideal as 1aw Now PV n RT 2 3205x/ x 29 malr atn P -1 KK 1 aku 5G.704 x 105 L 0 567 mL

etthanel tu ouadh Volume forsant 0'S67 209 02t3 1.