Problem Statement: Baker's yeast fermentation can be described by the following reaction:
a C6H12O6 + b O2 + c NH3 ---------> C6H10NO3 + d H2O + e CO2 + f C2H6O (glucose) (yeast) (ethanol)The fermentor is continuously monitored with an oxygen gas sensor and a carbon dioxide gas sensor. From these measurements, one can construct the respiratory quotient (RQ), which is defined as the number of moles of CO2 produced per mole of O2 consumed during fermentation. Given the RQ and the yeast yield Yx (i.e., the number of grams of yeast produced per gram of glucose consumed), find the ethanol yield Yp (i.e., the number of grams of ethanol produced per gram of glucose consumed) in terms of RQ and Yx. When Yx=0.5, what does a measurement of RQ=1 tell you?
Species Formula MW
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Glucose C6H12O6 180
Yeast C6H10NO3 144
Ammonium Sulfate (NH4)2SO4 132
Ethanol C2H6O 46
Solution:
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