The diatomic molecule OH exists in the gas phase. OH plays an important part in combustion reactions and is a reactive oxidizing agent in polluted air. The bond length and bond energy have been measured to be 97.06 pm and 424.7 kJ/mol, respectively. Assume that the OH molecule is analogous to the HF molecule discussed in the chapter and that the MOs result from the overlap of a pz orbital from oxygen and the 1s orbital of hydrogen (the OOH bond lies along the z axis).

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The diatomic molecule OH exists in the gas phase. OH plays
an important part in combustion reactions and is a reactive
oxidizing agent in polluted air. The bond length and bond
energy have been measured to be 97.06 pm and 424.7 kJ/mol,
respectively. Assume that the OH molecule is analogous to the
HF molecule discussed in the chapter and that the MOs result
from the overlap of a pz orbital from oxygen and the 1s orbital
of hydrogen (the OOH bond lies along the z axis).

62. The diatomic molecule OH exists in the gas phase. OH plays
an important part in combustion reactions and is a reactive
oxidizing agent in polluted air. The bond length and bond
cncrgy have been measured to be 97.06 pm and 424.7 kJ/mol,
respectively. Assume that the OH molecule is analogous to the
HF molecule discussed in the chapter and that the MOs result
from the overlap of ap, orbital from oxygen and the Is crbital
of hydrogen (the O-H bond lies along the z axis).
a. Draw pictures of the sigma bonding and antibonding
molecular orbitals in OH.
b. Which of the two MOs has the greater hydrogen 1s
character?
c. Can the 2p, orbital of oxygen form MOs with the Is
orbital of hydrogen? Explain.
d. Knowing that only the 2p orbitals of oxygen interact
significantly with the Is orbital of hydrogen, complete the
MO energy-level diagram for OH. Place the correct num-
ber of clectrons in the energy levels.
1s
2p; 2p. 2,
25
AO of
Molecular
orbitals
AO's of
hydrogen
oxygen
e. Estimate the bond order for OH.
f. Predict whether the bond order of OH" is greater than,
less than, or the same as that of OH. Explain.
-Increasing stabifity
Transcribed Image Text:62. The diatomic molecule OH exists in the gas phase. OH plays an important part in combustion reactions and is a reactive oxidizing agent in polluted air. The bond length and bond cncrgy have been measured to be 97.06 pm and 424.7 kJ/mol, respectively. Assume that the OH molecule is analogous to the HF molecule discussed in the chapter and that the MOs result from the overlap of ap, orbital from oxygen and the Is crbital of hydrogen (the O-H bond lies along the z axis). a. Draw pictures of the sigma bonding and antibonding molecular orbitals in OH. b. Which of the two MOs has the greater hydrogen 1s character? c. Can the 2p, orbital of oxygen form MOs with the Is orbital of hydrogen? Explain. d. Knowing that only the 2p orbitals of oxygen interact significantly with the Is orbital of hydrogen, complete the MO energy-level diagram for OH. Place the correct num- ber of clectrons in the energy levels. 1s 2p; 2p. 2, 25 AO of Molecular orbitals AO's of hydrogen oxygen e. Estimate the bond order for OH. f. Predict whether the bond order of OH" is greater than, less than, or the same as that of OH. Explain. -Increasing stabifity
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