Multiple Choice
Use the bond energies provided to estimate ΔH°_rxn for the reaction: 2 Br2(l) + C2H2(g) → C2H2Br4(l). What is the estimated ΔH°_rxn?
11. Bonding & Molecular Structure
Bond Energy
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Which of the following compounds has the stronger nitrogen-nitrogen bond?
A
H2NNH2
B
HNNH
Verified step by step guidance1
Identify the types of bonds present in each compound. In H2NNH2 (hydrazine), the nitrogen atoms are connected by a single bond. In HNNH (diazene), the nitrogen atoms are connected by a double bond.
Recall that multiple bonds (double or triple bonds) are generally stronger than single bonds. This is because multiple bonds involve more shared electrons, which increases the bond strength.
Consider the bond order, which is the number of chemical bonds between a pair of atoms. A higher bond order indicates a stronger bond. For H2NNH2, the bond order between the nitrogen atoms is 1, while for HNNH, the bond order is 2.
Understand that the bond strength is also influenced by the bond length. Generally, shorter bonds are stronger. Double bonds are shorter than single bonds, contributing to their increased strength.
Conclude that HNNH, with a nitrogen-nitrogen double bond, has a stronger bond compared to the single bond in H2NNH2, due to the higher bond order and shorter bond length.
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