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The susceptibility of FeCl2 obeys the Curie-Weiss law over the temperature range 90 to 300 K, with 0= 48 K. Its molecular susceptibility at 20 °C is 1.475 x 10

2 emu/g mol Oe. a. What is the effective magnetic moment in Bohr magnetons? b. What are the spin-only values of J and un (max)? c. At an applied field of 10,000 Oe, what is the intensity of the molecular field at 20 °C and at -150 °C?

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