   # Consider the following equations: 3 A + 6 B → 3 D Δ H = − 403 KJ/mol E + 2 F → A Δ H = − 105.2 KJ/mol C → E+3D Δ H = 64.8 K J / m o l Suppose the first equation is reversed and multiplied by 1 6 , the second and third equations are divided by 2, and the three adjusted equations are added. What is the net reaction and what is the overall heat of this reaction? ### Chemistry

10th Edition
Steven S. Zumdahl + 2 others
Publisher: Cengage Learning
ISBN: 9781305957404

#### Solutions

Chapter
Section ### Chemistry

10th Edition
Steven S. Zumdahl + 2 others
Publisher: Cengage Learning
ISBN: 9781305957404
Chapter 6, Problem 115AE
Textbook Problem
3 views

## Consider the following equations: 3 A + 6 B → 3 D Δ H = − 403   KJ/mol E + 2 F → A Δ H = − 105.2   KJ/mol C → E+3D Δ H = 64.8   K J / m o l Suppose the first equation is reversed and multiplied by 1 6 , the second and third equations are divided by 2, and the three adjusted equations are added. What is the net reaction and what is the overall heat of this reaction?

Interpretation Introduction

Interpretation: The enthalpy change ΔH of given reaction has to be calculated.

Concept Introduction:

Hess's Law:

• The enthalpy change accompanying a chemical reaction is self-determining of the route by which the chemical reaction occurs.
• Hess's Law is saying that if you convert reactants to productsthe overall enthalpy change will be exactly the same whether you do it in one or multiple steps.

Formula:

ΔH(total)ΔH(number of steps)......(1)

Rules:

• The sign of ΔH reversedwhenthe reaction is reversed.
• The quantity of reactants and products is directly proportional to the magnitude of ΔH in a reaction. If the coefficients in a balanced reaction are multiplied by an integer, the value of ΔHis multiplied by the same integer.

### Explanation of Solution

Explanation

3A+6B3DΔH1=-403KJ/mol......(1)E+2FAΔH2=-105.2KJ/mol......(2)CE+3DΔH3=64.8KJ/mol......(3)

• The first equation is reversed and multiplied by 16 .
• Second and third equations are divided by 2.

Formula:

ΔH=ΔH1+ΔH2+ΔH3+.....(2)

ΔH=-16(-403)+12(-105.5)+12(64

### 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

Find more solutions based on key concepts
Some segments of a protein strand coil, somewhat like a metal spring, because a. amino acids at different place...

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

List the differences between mitosis and meiosis in the following chart:

Human Heredity: Principles and Issues (MindTap Course List)

A regular tetrahedron is a pyramid with a triangular base and triangular sides as shown in Figure P28.73. Imagi...

Physics for Scientists and Engineers, Technology Update (No access codes included)

Find the rms speed of hydrogen molecules (H2) at a temperature of 27C.

Physics for Scientists and Engineers: Foundations and Connections

What is the composition of air?

Oceanography: An Invitation To Marine Science, Loose-leaf Versin 