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anap Chrome File Edit View History Bookmarks Window People Help Bb MyPsychLab g-2 x HW11 due Apr 6 015 C ezto.mheducation.com Ihm.tpx CHM 11600 Sp2015: 11600A (10:30 or 11:30 CHEMISTRY AM lecture) Hw11 due Apr 6 next prev Question #7 (of 14) value: 0.71 points Ch. Ex. 85 Enthalpies and Winemaking/ cp85 1 out of 3 attempts LA NetCalculator Be sure to answer all parts. Assistance In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH20H ethanol and CO2. During cellular respiration, sugar and ethanol are "burned" to water Check My Work View Hint vapor and CO View Qu (a) Using CoE 206 for sugar, calculate AH of fermentation and of respiration Question Help (combustion). kJ Respiration Fermentation Report a Problem (b) write a combustion reaction for ethanol. Include the physical states of each reactant and product Which releases more heat from combustion per mole of C, sugar or ethanol? O ethanol sugar references book & resources Patricia Regan save & exit Sun Apr 5 1 08 PM (30%) instructions l help submit assignment

Explanation / Answer

1. C6H12O6 --> 2C2H5OH + 2CO2
2C2H5OH + 7O2 --> 4CO2 + 6H2O
the values that you need are ?Hformation of glucose, ethanol, CO2 and H2O
-1273.3kJ/mole, -234.8kJ/mole, -393.5kJ/mole, -241.8kJ/mole, respectively

(2?Hformation EtOH + ?Hformation CO2) - (?Hformation glucose) = ?Hfermentation
(4?Hformation CO2 + 6?Hformation H2O) - (2?Hformation EtOH) = ?Hrespiration

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