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Chemistry: An Atoms First Approach

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

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BuyFindarrow_forward

Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 4, Problem 79E
Textbook Problem
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Acetylene (C2H2) can be produced from the reaction of calcium carbide (CaC2) with water. Use both the localized electron and molecular orbital models to describe the bonding in the acetylide anion (C22−).

Interpretation Introduction

Interpretation: The bonding in C22 ion, is to be described using the localized electron model and molecular orbital model.

Concept introduction: The valence bond theory is based on the assumption that all the bonds present between two atoms are localized bonds formed by the donation of an electron from each atom. The localized electron model consists of the following,

  • The Lewis structure is drawn.
  • The arrangement of the electron pairs is determined.
  • The required hybrid orbitals are specified.

The electronic configuration for multi-electron atom is written using the molecular orbitals. The bond order is calculated by difference between the anti-bonding electrons and the bonding electrons by two. This can be stated as,

Bondorder=[(Electronsinbondingorbitals)(Electronsinanti-bondingorbitals)]2

To determine: Bonding in C22 on the basis of the localized electron model and molecular orbital model.

Explanation of Solution

Bonding in C22 ion on the basis of the localized electron model

The electronic configuration of the elements present in the given compound is,

C=1s22s22p2

The number of valence electron in carbon atom is 4

The total number of valence electrons in C22 ion is (2×4)e+2e=10e.

The Lewis structure of the given compound is,

Figure 1

For this ion,

  • The σ bond is formed by sp.hybrid orbital and π bond is formed by two unhybridized p orbital Hence, one sigma and two pie bonds is formed in C22 ion

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Chapter 4 Solutions

Chemistry: An Atoms First Approach
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