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Write a balanced chemical equation for the fermentation of sugar (C12H22O11) by yeasts

Chapter 7, Problem 47P

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QUESTION:

Write a balanced chemical equation for the fermentation of sugar (\(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\)) by yeasts in which the aqueous sugar reacts with water to form aqueous ethyl alcohol (\(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)) and carbon dioxide gas.

Equation Transcription:

Text Transcription:

C_12 H_22 O_11

C_2 H_5 OH

Questions & Answers

QUESTION:

Write a balanced chemical equation for the fermentation of sugar (\(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\)) by yeasts in which the aqueous sugar reacts with water to form aqueous ethyl alcohol (\(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)) and carbon dioxide gas.

Equation Transcription:

Text Transcription:

C_12 H_22 O_11

C_2 H_5 OH

ANSWER:

Solution 47P

Sucrose is a dimer of glucose and fructose molecules. In the first step of alcoholic fermentation, the enzyme invertase cleaves the glycosidic linkage between the glucose and fructose molecules.

C12H22O11 + H2O + invertase → 2 C6H12O6

Next, each glucose molecule is broken down into two pyruvate molecules in a process known as glycolysis. Glycolysis is summarized by the equation:

C6H12O

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