Multiple Choice
Given that the enthalpy change (ΔH) for the formation of H2O(g) from its elements is -926.29 kJ/mol, what is the approximate bond energy of the O-H bond in water?
11. Bonding & Molecular Structure
Bond Energy
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Which of the following bonds is the strongest?
A
C−N
B
C=N
C
C≡N
D
It is not possible to tell.
E
All of the above bonds have approximately the same bond strength.
Verified step by step guidance1
Understand the concept of bond strength: Bond strength is related to the bond order, which is the number of chemical bonds between a pair of atoms. Higher bond order generally means stronger bonds.
Identify the types of bonds: The problem lists three types of bonds between carbon (C) and nitrogen (N): single bond (C−N), double bond (C=N), and triple bond (C≡N).
Compare bond orders: A single bond (C−N) has a bond order of 1, a double bond (C=N) has a bond order of 2, and a triple bond (C≡N) has a bond order of 3.
Relate bond order to bond strength: Generally, the higher the bond order, the stronger the bond. Therefore, a triple bond (C≡N) is stronger than a double bond (C=N), which is stronger than a single bond (C−N).
Conclude based on bond order: Since the triple bond (C≡N) has the highest bond order, it is the strongest bond among the options provided.
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