Chemistry: An Atoms First Approach

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



Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 19, Problem 73AE
Textbook Problem

Hydrazine (N2H4) is used as a fuel in liquid-fueled rockets. When hydrazine reacts with oxygen gas, nitrogen gas and water vapor are produced. Write a balanced equation and use bond energies from Table 3-3 to estimate ∆H for this reaction.

Interpretation Introduction

Interpretation: The balanced equation for the reaction of hydrazine with oxygen is to be stated. The value of ΔH° for this reaction is to be calculated using the bond energies from Table 3-3 .

Concept introduction: The expression to calculate the value of ΔH° is,


To determine: The balanced equation for the reaction of hydrazine with oxygen; the value of ΔH° for this reaction is to be calculated using the bond energies from Table 3-3 .

Explanation of Solution

The balanced reaction is,


Reaction between hydrazine (N2H4) with oxygen (O2) yields nitrogen gas (N2) and water (H2O) . The balanced reaction is,


The required value of ΔH° for the given reaction is 590kJ_ .

Refer to Table 3-3 .

The value of bond energy, D°(kJ/mol) , for the given reactant and product is,

Bonds D°(kJ/mol)
NH 391
NN 160
NN 941
OH 467
O=O 495

The formula of ΔH° is,



  • np is the number of moles of each product

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Chapter 19 Solutions

Chemistry: An Atoms First Approach
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Predict the...Ch. 19 - Give the Lewis structure, molecular structure, and...Ch. 19 - Fluorine reacts with sulfur to form several...Ch. 19 - Predict some possible compounds that could form...Ch. 19 - How does the oxyacid strength of the halogens vary...Ch. 19 - Explain why HF is a weak acid, whereas HCI, HBr,...Ch. 19 - The xenon halides and oxides are isoelectronic...Ch. 19 - For each of the following, write the Lewis...Ch. 19 - Although He is the second most abundant element in...Ch. 19 - The noble gas with the largest atmospheric...Ch. 19 - There is evidence that radon reacts with fluorine...Ch. 19 - For the RnFx compounds you predicted in Exercise...Ch. 19 - Hydrazine (N2H4) is used as a fuel in...Ch. 19 - The inert-pair effect is sometimes used to explain...Ch. 19 - How could you determine experimentally whether the...Ch. 19 - The resistivity (a measure of electrical...Ch. 19 - Slaked lime, Ca(OH)2 is used to soften hard water...Ch. 19 - EDTA is used as a complexing agent in chemical...Ch. 19 - Photogray lenses contain small embedded crystals...Ch. 19 - Draw Lewis structures for the AsCl4+ and AsCl6...Ch. 19 - Provide a reasonable estimate for the number of...Ch. 19 - In large doses, selenium is toxic. 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