In wine making, the sugars in grapes undergo fermentationbyyeast to yield CH₃CH₂OH and CO₂. During cellular respiration,sugar and ethanol are “burned” to water vapor and CO₂.(a) Using C₆H₁₂O₆ for sugar, calculate ΔH°ᵣₓₙ of fermentation and of respiration (combustion).(b) Write a combustion reaction for ethanol. Which has a higher ΔH°ᵣₓₙ for combustion per mole of C, sugar or ethanol?

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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In wine making, the sugars in grapes undergo fermentationbyyeast to yield CH₃CH₂OH and CO₂. During cellular respiration,sugar and ethanol are “burned” to water vapor and CO₂.(a) Using C₆H₁₂O₆ for sugar, calculate ΔH°ᵣₓₙ of fermentation and of respiration (combustion).(b) Write a combustion reaction for ethanol. Which has a higher ΔH°ᵣₓₙ for combustion per mole of C, sugar or ethanol?

Expert Solution
Step 1

The values are used from internet for reference as they are not mentioned.

 

The ∆Hf for C6H12O6 is -1273.3 kJ/mol, for CO2 is -393.5 kJ/mol, and for O2 is 0 kJ/mol, for H2O is -241.826 kJ/mol, and for ethanol (C2H5OH) is -277.63 kJ/mol.

Step 2

The equation corresponding to combustion fermentation of glucose is shown below.

Chemistry homework question answer, step 2, image 1

The enthalpy change during a reaction is given as,

Chemistry homework question answer, step 2, image 2

Here, m and n are number of moles.

 

Step 3

Substitute the ∆Hf values in the formula.

Chemistry homework question answer, step 3, image 1

The equation corresponding to the respiration of glucose is shown below.

Chemistry homework question answer, step 3, image 2

 

Step 4

Substitute the ∆Hf values in the formula.

Chemistry homework question answer, step 4, image 1

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