Chapter 9, Problem 9.22P

Interpretation Introduction

(a)

Interpretation:

The standard heat of fermentation reaction needs to be determined.

${\text{C}}_{\text{12}}{\text{H}}_{\text{22}}{\text{O}}_{\text{11}}\left(aq\right)+{\text{H}}_{\text{2}}\text{O}\to 4{\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\text{OH}\left(aq\right)+4{\text{CO}}_{\text{2}}\left(g\right)$

Concept introduction:

:Breakdown of the substance with the help of bacteria, yeast or any other micro-organisms is called fermentation. The heat released or absorbed from the fermentation process is called heat of fermentation.

Heat of Fermentation can be calculated as;

$\Delta H_{C,1}^{\text{o}}=\Delta H_{C,2}^{\text{o}}-\Delta H_{C,3}^{\text{o}}$

Interpretation Introduction

(b)

Interpretation:

The stoichiometric coefficients of modified fermentation reaction needs to be determined which accounts yeast production and shows consumption for added ammonia and heat of fermentation.

${\text{C}}_{\text{12}}{\text{H}}_{\text{22}}{\text{O}}_{\text{11}}\left(aq\right)+c{\text{NH}}_{\text{3}}\left(aq\right)\to d{\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\text{OH}\left(aq\right)+e{\text{CO}}_{\text{2}}\left(g\right)+f{\text{CH}}_{\text{1}\text{.8}}{\text{O}}_{\text{0}\text{.5}}{\text{N}}_{\text{.2}}\left(s\right)+g{\text{H}}_{\text{2}}\text{O}$

Concept introduction:

Breakdown of the substance with the help of bacteria, yeast or any other micro-organisms is called fermentation. The heat released or absorbed from the fermentation process is called heat of fermentation. Here fermentation reaction accounts Yeast production and shows consumption for added Ammonia.

$\text{Molar Heat of Consumption of Yeast=Heat of Consumption of Yeast×Molecular Weight of Yeast}$