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Homework4

# Homework4 - MSE 110 Problem Set 4 Problem 1 Carbon monoxide...

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MSE 110 Problem Set 4 Problem 1 Carbon monoxide CO is a toxic molecule release in car exhaust. Build its MO diagram and find its bond order. (7pts) [Answer in number] Ans: The C atom provides 6 electrons and the O atom provides 8 electrons for a total of 14 electrons from which 10 are in bonding and 4 in antibonding orbitals. B.O=1/2(10-4)=3 The CO molecule is a stable molecule with a triple bond. O C 1

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Problem 2 Build it s MO diagram of the BN molecule. Do you expect the BN molecule to be paramagnetic or diamagnetic? (8pts) [Answer A or B] A- paramagnetic B- diamagnetic Ans: The BN molecule has a total of 12 electrons. Following the Hunds rule two electrons will occupy both π orbitals with their spin up. This will produce a net magnetization of the ion, which is therefore paramagnetic. N B 2
Problem 3 Do you expect the BN molecule to be more stable after? (8pts) [Answer A or B] A the gain of a electron B the loss of an electron Ans: The loss of an electron would decrease the bond order from 2 to 1.5 while the gain of an electron would increase it to 2.5. Hence the gain of a electron stabilizes the BN molecule. Problem 4 Do you expect the F 2 molecule to be paramagnetic or diamagnetic? (8pts) [Answer A, B] A-paramagnetic B-diamagnetic Ans: All the electrons are paired in the F 2 molecule; hence it has no net magnetic dipole. It is diamagnetic.

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Homework4 - MSE 110 Problem Set 4 Problem 1 Carbon monoxide...

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