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When a suspected drunken driver 188 mL of his breath blowing through the fuel cell alcohol tester?
When a suspected drunken driver 188 mL of his breath blows described by the fuel cell alcohol tester in section 18. 7, produces the alcohol tester average of 324 mA for 10 s. For example, a pressure of 1 0 ATM and a temperature of 25o C, the percentage (by volume) of the driver’s breath ethanol?
CH3CH2OH (g) +O2(g) –> HC2H3O2 (g) + H2O (l)4 electrons transferred
1 A= 6.25 x 10^18 electrons/1sec
324mA= .324 A
.324A= 2.025 x 10^18 electrons/sec
Over ten seconds = 2.025 x 10^19 electrons
2.025 x 10^19 electrons / 4 electrons transferred = 5.0625 x 10^18
22.4 L .188 L
——–= ———
6.022 x 10^23 molecules X
X= 5.0542 x 10^21
5.0625 x 10^18
——————= .001
5.0542 x 10^21
.001 x 100%= .10 BAC