Chem 103OptionalProblems4

Chem 103OptionalProblems4 - electrons at these two...

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Chem 103 Optional Problems 4 (taken from Miessler and Tarr) 1. Determine which of the following is paramagnetic, explain your choice, and estimate its magnetic moment. [Fe(CN) 6 ] 4- [Co(H 2 O) 6 ] 3+ [CoF 6 ] 3- [RhF 6 ] 3- 2. The compound trans -Fe(o-phen) 2 (NCS) 2 has a magnetic moment of 0.65 Bohr magneton at 80 K, increasing with temperature to 5.2 Bohr magnetons at 300K. a. Assuming a spin-only magnetic moment, calculate the number of unpaired
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Unformatted text preview: electrons at these two temperatures b. How can the increase in magnetic moment with temperature be explained? (Hint: There is also a significant change in the UV-visible spectrum with temperature) 3. The high-spind d 4 complex [Cr(H 2 O) 6 ] 2+ is labile, but the low spin d 4 complex ion [Cr(CN) 6 ] 4-is inert. Explain....
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