A student is required to prepare 25.0 mL of ethanol using a sucrose fermentation
ID: 786054 • Letter: A
Question
A student is required to prepare 25.0 mL of ethanol using a sucrose fermentation technique. How many grams of sucrose should the student use as a starting material if the expected recovery is 80% and the enzymatic system works at 65% efficiency?
(density of ethanol 0.789 g/ml)
C12H22O11 + H2O rigtarrow Zymases 4 CH3CH2OH + 4 CO2 How many mL of carbon dioxide are expected from the fermentation of 0.015 kg of sucrose with 65% efficiency, when the temperature is 85oF and the pressure is 1.25 atm? (density of ethanol 0.789 g/mL) If the evolved carbon dioxide produced in the question above was collected in a balloon whose maximum capacity is 0.5 L, will the balloon burst?Explanation / Answer
ethanol molar mass=44g/mol
25mL of ethanol=25*0.789=19.725gm
sucrose molar mass=342gm/mole
1mole ethanol produced from 1mole sucrose
19.725 gm proded from 0.45 mole sucrose=153.32gm
required sucrose =153.32*1.8*1.65=455.36gm
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