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# Heat Created by Fermentation and Combustion of Glucose

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Alcoholic fermentation by microorganisms involves the breakdown of glucose into ethanol and carbon dioxide.

C6H12O6 (s) -->; 2 C2H5OH (l) + 2 CO2 (g)

a) Calculate the amount of heat liberated in a yeast brew upon fermentation of 1 mol of glucose at 25 Â°C and 1 atm.
b) What fraction is the heat calculated in (a) of the amount of heat liberated by the complete combustion of glucose to CO2 and H20 (l) under the same conditions?

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#### Solution Preview

The main things to consider are the uses and manipulation of enthalpies of formation.

My Source for the heats of formation values was the National Institute for Standards and Technology website

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#### Solution Summary

This solution explains how to calculate the amount of heat liberated in a yeast brew upon fermentation of 1 mol of glucose at 25 Â°C and 1 atm. Additionally, it shows how to determine what fraction the heat is calculated in (a) of the amount of heat liberated by the complete combustion of glucose to CO2 and H20 (l) under the same conditions.

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