   # For the following reactions at constant pressure, predict if Δ H &gt; Δ E , Δ H &lt; Δ E , or Δ H = ΔE a. 2 HF ( g ) → H 2 ( g ) + F 2 ( g ) b. N 2 ( g ) + 3 H 2 ( g ) → 2NH 3 ( g ) c. 4NH 3 ( g ) + 5 O 2 ( g ) → 4NO ( g ) + 6H 2 O ( g ) ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 16, Problem 103CP
Textbook Problem
35 views

## For the following reactions at constant pressure, predict if Δ H > Δ E ,   Δ H < Δ E ,   or   Δ H = ΔE a. 2 HF ( g ) → H 2 ( g ) + F 2 ( g ) b. N 2 ( g ) + 3 H 2 ( g ) → 2NH 3 ( g ) c. 4NH 3 ( g ) + 5 O 2 ( g ) → 4NO ( g ) + 6H 2 O ( g )

(a)

Interpretation Introduction

Interpretation: The relation between ΔE and ΔH is to be predicted for the given reactions.

Concept introduction: The expression of Δng is,

Δng=(Numberofgaseousmoleculesonproduct)(Numberofgaseousmoleculesonreactant)

• The reaction will be endothermic and ΔE>ΔH , when the value of Δng is negative.
• The reaction will be exothermic and ΔE<ΔH , when the value of Δng is positive.

To predict: The relation between ΔE and ΔH for the reaction 2HF(g)H2(g)+F2(g) .

### Explanation of Solution

The stated reaction is,

2HF(g)H2(g)+F2(g) .

The expression of Δng is,

Δng=(Numberofgaseousmoleculesonproduct)(Numberofgaseousmoleculesonreactant)

The number of gaseous molecules in the product side of the given reaction is 2 .

The number of gaseous molecules in the reactant side of the given reaction is 2 .

Substitute the value of the number of gaseous molecules of the reactant and the product in the above expression.

Δng=(Numberofgaseousmoleculesonproduct)(Numberof

(b)

Interpretation Introduction

Interpretation: The relation between ΔE and ΔH is to be predicted for the given reactions.

Concept introduction: The expression of Δng is,

Δng=(Numberofgaseousmoleculesonproduct)(Numberofgaseousmoleculesonreactant)

• The reaction will be endothermic and ΔE>ΔH , when the value of Δng is negative.
• The reaction will be exothermic and ΔE<ΔH , when the value of Δng is positive.

To predict: The relation between ΔE and ΔH for the reaction N2(g)+3H2(g)2NH3(g) .

(c)

Interpretation Introduction

Interpretation: The relation between ΔE and ΔH is to be predicted for the given reactions.

Concept introduction: The expression of Δng is,

Δng=(Numberofgaseousmoleculesonproduct)(Numberofgaseousmoleculesonreactant)

• The reaction will be endothermic and ΔE>ΔH , when the value of Δng is negative.
• The reaction will be exothermic and ΔE<ΔH , when the value of Δng is positive.

To predict: The relation between ΔE and ΔH for the reaction 4NH3(g)+5O2(g)4NO(g)+6H2O .

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