Answered: N atomic orbitals NO molecular orbitals…

Chemistry for Engineering Students

3rd Edition

ISBN:9781285199023

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter1: Introduction To Chemistry

Section: Chapter Questions

Problem 1.82PAE: Use the web to research the elastic modulus and yield strength of carbon fiber composites. How do...

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Carbon monoxide, CO, is isoelectronic to N₂. (a) Draw a
Lewis structure for CO that satisfies the octet rule. (b) Assume
that the diagram in Figure 9.46 can be used to describe
the MOs of CO. What is the predicted bond order for
CO? Is this answer in accord with the Lewis structure you
drew in part (a)? (c) Experimentally, it is found that the
highest energy electrons in CO reside in a σ-type MO. Is
that observation consistent with Figure 9.46? If not, what
modification needs to be made to the diagram? How does
this modification relate to Figure 9.43? (d) Would you expect
the π_2p MOs of CO to have equal atomic orbital contributions
from the C and O atoms? If not, which atom would
have the greater contribution?

N atomic
orbitals
NO molecular
orbitals
O atomic
orbitals
2p
1 11
2p
11
|1
2s
2s
N atom
NO molecule
O atom
Figure 9.46
Energy

Large 2s-2p interaction
Small 2s-2p interaction
B2
C2
N2
O2
F2
Nez
oi,
1 1
1L 11
T2p
1 1
11 11
T2p
11
11
11
ož,
1L
1L
11
1L
11
11
o2s
Bond order
2
3
2
Bond enthalpy (kJ/mol)
Bond length (Å)
Magnetic behavior
290
620
941
495
155
1.59
1.31
1.10
1.21
1.43
Paramagnetic
Diamagnetic
Diamagnetic
Paramagnetic
Diamagnetic
A Figure 9.43 Molecular orbital electron configurations and some experimental data for period 2
diatomic molecules.
Energy
• |||

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