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The problem is given the below table for iron ammonium alum find C the Curie constant for this material..

T(in kelvin)..............X_m

15..........................(129*10^-4)

100........................(19.4*10^-4)

200........................(9.7*10^-4)

300........................(6.5*10^-4)

as X = C/T I thought simply rearrange:

=> XT = C

and so take any two values from above table and plug them into equation:

=> C = 15*(129*10^-4)K.A/T.m ---------where 15 and (129*10^-4) are taken from above table........

However, this is not the correct value for the curie constant for this material...

Can anyone please tell me where I am going wrong?

Thanks

Andrew