   Chapter 24, Problem 24PS

Chapter
Section
Textbook Problem

The chemical equation for the fermentation of glucose into ethanol isC6H12O6(s) → 2 C2HsOH(ℓ)+ 2 CO2(g)Using ∆fH° values at 25 °C, calculate ∆rH° for this reaction. (See Question 23 for ∆fH° for glucose.)

Interpretation Introduction

Interpretation:

The value of ΔrH° for the given fermentation reaction of glucose into ethanol has to be calculated.

C6H12O6(s)2C2H5OH(l)+2CO2(g)

Concept introduction:

The change in the enthalpy of a reaction when reactant is converted into product under standard conditions is called standard enthalpy of reaction.

The expression for standard enthalpy of reaction is,

ΔrH°=nΔfH°(products)nΔfH°(reactants) (1)

Here, ΔfH° is the standard enthalpy of formation and n is the number of moles of reactant and product in the balanced chemical reaction.

Explanation

The value of ΔrH° for the fermentation reaction of glucose into ethanol is calculated below.

Given:

Refer to Appendix L for the values of standard enthalpy of formation.

The standard enthalpy of formation of C6H12O6(s) is 1273.3 kJ/mol.

The standard enthalpy of formation of C2H5OH(l) is 277 kJ/mol.

The standard enthalpy of formation of CO2(g) is 393.5 kJ/mol.

The given balanced chemical equation is:

C6H12O6(s)2C2H5OH(l)+2CO2(g)

The ΔrH° can be calculated by the following expression,

ΔrH°=nΔfH°(products)nΔfH°(reactants)=[[(2 mol CO2(g)/mol-rxn)ΔfH°[CO2(g)]+(2 mol C2H5OH(l)/mol-rxn)Δf

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Which is required as part of hemoglobin? iron calcium vitamin C potassium

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

What are sister chromatids?

Human Heredity: Principles and Issues (MindTap Course List)

What is a life cycle?

Biology: The Dynamic Science (MindTap Course List) 