Multiply the reading by 10. It is best to take two measurements of the sample. If the two measurements result is very different measurements of X g , it may indicate that one of the samples was not packed well. If there is cooperative magnetism, this section does not apply. The measurement taken and the X m determined is the total susceptibility of the substance.
All substances contain a diamagnetic contribution from all of the paired electrons.
The paramagnetic contribution comes only from the unpaired electrons. To determine the number of unpaired electrons in the molecue or unit, the diamagnetic contribution must be eliminated. This is fairly simple because the diamagnetic susceptibilities are fairly additive. In table 1, you will find the diamagnetic susceptiblilites for a variety of functional groups, ions, and atoms. Adding all of the diamagnetic susceptibilities for all of the parts of the substance will give you a good approximation for the diamagnetic susceptibility of the substance.