BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Solutions

Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Write balanced equations for the combustion of ethane gas and liquid ethanol (to give gaseous products).

(a) Calculate the enthalpy of combustion of each compound. Which has the more negative enthalpy change for combustion per gram?

(b) If ethanol is assumed to be partially oxidized ethane, what effect does this have on the enthalpy of combustion?

(a)

Interpretation Introduction

Interpretation:

The balanced equations for the combustion of ethane gas and liquid ethanol have to be written and calculate the enthalpy of combustion of each component.

Concept introduction:

  • Balanced chemical equation of a reaction is written according to law of conservation of mass.
  • Stoichiometry of a chemical reaction is the relation between reactants and products of the reaction and it is represented by the coefficients used for the reactants and products involved in the chemical equation.

    Enthalpy of combustion:

  • The standard enthalpy of combustion is the enthalpy change that occurs when one mole of substance burns completely under the standard conditions of 250C and 1 atm.
  • The standard enthalpy of combustion is always negative.
Explanation

Let’s write the balanced equation of combustion of ethane:

2C2H6(g) + 7O2(g)  4CO2(g) + 3H2O(l)

Let’s calculate the enthalpy of combustion:

ΔHrxn=nΔHfo (products) - nΔHfo (reactants)= 4ΔHfo (CO2(g)) + 6ΔHfo (H2O(l)) - 7ΔHfo (O2(g))- 2ΔHfo(C2H6(g))= 4 × (-393.5 kj/mol) + 6×(-285.83) - 7 (0 kj/mol) - 2×(-83.85 kj/mol)= - 3121.3 kj

The combustion of one mole of ethane released - 3121.3 kj energy.

Let’s calculate the energy released by 1 gm of ethane:

Relaesed Energy for1gm ethane = -1560.6 kj/mol30 g/mol= -52 kJ/g

Therefore, Heat of combustion of ethane is - 52 kJ/g

(b)

Interpretation Introduction

Interpretation:

If ethanol is assumed to be partially oxidized ethane, then the effect does this have on the enthalpy of combustion should be determined.

Concept introduction:

Enthalpy of combustion:

  • The standard enthalpy of combustion is the enthalpy change that occurs when one mole of substance burns completely under the standard conditions of 250C and 1 atm.
  • The standard enthalpy of combustion is always negative.

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

Chapter 23 Solutions

Show all chapter solutions add
Sect-23.5 P-1.3ACPSect-23.5 P-2.1ACPSect-23.5 P-2.2ACPSect-23.5 P-2.3ACPSect-23.5 P-3.1ACPSect-23.5 P-3.2ACPSect-23.5 P-3.3ACPSect-23.5 P-3.4ACPSect-23.5 P-3.5ACPCh-23 P-1PSCh-23 P-2PSCh-23 P-3PSCh-23 P-4PSCh-23 P-5PSCh-23 P-6PSCh-23 P-7PSCh-23 P-8PSCh-23 P-9PSCh-23 P-10PSCh-23 P-11PSCh-23 P-12PSCh-23 P-13PSCh-23 P-14PSCh-23 P-15PSCh-23 P-16PSCh-23 P-17PSCh-23 P-18PSCh-23 P-19PSCh-23 P-20PSCh-23 P-21PSCh-23 P-22PSCh-23 P-23PSCh-23 P-24PSCh-23 P-25PSCh-23 P-26PSCh-23 P-27PSCh-23 P-28PSCh-23 P-29PSCh-23 P-30PSCh-23 P-31PSCh-23 P-32PSCh-23 P-33PSCh-23 P-34PSCh-23 P-35PSCh-23 P-36PSCh-23 P-37PSCh-23 P-38PSCh-23 P-39PSCh-23 P-40PSCh-23 P-41PSCh-23 P-42PSCh-23 P-43PSCh-23 P-44PSCh-23 P-45PSCh-23 P-46PSCh-23 P-47PSCh-23 P-48PSCh-23 P-49PSCh-23 P-50PSCh-23 P-51PSCh-23 P-52PSCh-23 P-53PSCh-23 P-54PSCh-23 P-55PSCh-23 P-56PSCh-23 P-57PSCh-23 P-58PSCh-23 P-59PSCh-23 P-60PSCh-23 P-61PSCh-23 P-62PSCh-23 P-63PSCh-23 P-64PSCh-23 P-65PSCh-23 P-66PSCh-23 P-67PSCh-23 P-68PSCh-23 P-69PSCh-23 P-70PSCh-23 P-71PSCh-23 P-72PSCh-23 P-73PSCh-23 P-74PSCh-23 P-75GQCh-23 P-76GQCh-23 P-77GQCh-23 P-78GQCh-23 P-79GQCh-23 P-80GQCh-23 P-81GQCh-23 P-82GQCh-23 P-83GQCh-23 P-84GQCh-23 P-85GQCh-23 P-86GQCh-23 P-87GQCh-23 P-88GQCh-23 P-89GQCh-23 P-90GQCh-23 P-91GQCh-23 P-92GQCh-23 P-93GQCh-23 P-94GQCh-23 P-95GQCh-23 P-96GQCh-23 P-97GQCh-23 P-98GQCh-23 P-99GQCh-23 P-100GQCh-23 P-101GQCh-23 P-102GQCh-23 P-103ILCh-23 P-104ILCh-23 P-105ILCh-23 P-106ILCh-23 P-107ILCh-23 P-108ILCh-23 P-109ILCh-23 P-110ILCh-23 P-111ILCh-23 P-112ILCh-23 P-113ILCh-23 P-114ILCh-23 P-115SCQCh-23 P-116SCQCh-23 P-117SCQCh-23 P-118SCQCh-23 P-119SCQCh-23 P-120SCQCh-23 P-121SCQ

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

What is the difference between a molecular formula and a structural formula?

General Chemistry - Standalone book (MindTap Course List)

When searching for whole-grain bread, a consumer should search the labels. a. for words like multi-grain, wheat...

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

How does foliation differ from bedding planes?

Fundamentals of Physical Geography

Why are carbon atoms 1 and 3 of glyceraldehyde not considered chiral?

Chemistry for Today: General, Organic, and Biochemistry