Problem: One method of experimentally determining whether a species is paramagnetic is to weigh it in an instrument called a magnetic susceptibility balance. This is a balance with a strong electromagnet placed next to the sample holder. If the species is paramagnetic, the mass reading of the balance will increase when the field is switched on.Classify these species as paramagnetic or diamagneticNO   F2   O2   COWhich species will have the strongest mass shift on a magnetic susceptibility balance?a) F2b) O2c) NOd) CO

FREE Expert Solution

We are asked which species will have the strongest mass shift on a magnetic susceptibility balance


We can use the molecular orbital diagram to predict whether the molecule is paramagnetic or diamagnetic. 

If all the electrons are paired, the molecule is diamagnetic

If one or more electrons are unpaired, the molecule is paramagnetic.


F2

F→ Group 7A → 7 valence electrons

14 valence electrons TOTAL.

MO Diagram: 

No unpaired electrons → diamagnetic


O2

O→ Group 6A → 6 valence electrons

12 valence electrons TOTAL.

MO Diagram: 

2 unpaired electrons → paramagnetic


NO

N→ Group 5A → 5 valence electrons

O→ Group 6A → 6 valence electrons

11 valence electrons TOTAL.

MO Diagram: 

1 unpaired electron → paramagnetic


CO

C→ Group 4A → 4 valence electrons

O→ Group 6A → 6 valence electrons

10 valence electrons TOTAL.

MO Diagram: 


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Problem Details

One method of experimentally determining whether a species is paramagnetic is to weigh it in an instrument called a magnetic susceptibility balance. This is a balance with a strong electromagnet placed next to the sample holder. If the species is paramagnetic, the mass reading of the balance will increase when the field is switched on.

Classify these species as paramagnetic or diamagnetic

NO   F2   O2   CO

Which species will have the strongest mass shift on a magnetic susceptibility balance?

a) F2

b) O2

c) NO

d) CO


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