5 - X k(M-1 s-1 F Cl Br NCS N 3 1.2 x 10-3 11 60 1.2 x...

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1 Chemistry 172 Problem Set #5 Spring 2009 1 . The high-spin d 4 complex [Cr(OH 2 ) 6 ] 2+ is labile, but the low-spin d 4 complex [Cr(CN) 6 ] 4- is inert. Explain. 2 . Predict whether these complexes would be labile or inert and explain your choices. For each complex the magnetic moment is given in Bohr magnetons: Ammonium oxopentachlorochromate(V) 1.82 Potassium hexaiodomanganate(IV) 3.82 Potassium hexacyanoferrate(III) 2.40 Hexaammineiron(II) chloride 5.45 3 . The rate constants for the exchange reaction CrX 2+ + *Cr 2+ *CrX 2+ + Cr 2+ , where *Cr is radioactive 51 Cr, are given in the table for reactions at 0 °C and 1 M HClO 4 . Explain the differences in the rate constants in terms of the probable mechanism of the reaction.
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Unformatted text preview: X k (M-1 s-1 ) F Cl Br NCS N 3 1.2 x 10-3 11 60 1.2 x 10-4 (at 24 °C) > 1.2 4 . Is the reaction [Co(NH 3 ) 6 ] 3+ + [Cr(OH 2 ) 6 ] 2+ likely to proceed by an inner-sphere or outer-sphere mechanism? Explain your answer. 5 . Predict the products of the following reactions: 6 . The complex shown below loses CO on heating. Would you expect this CO to be 12 CO, 13 CO, or a mixture of both? Why? 2 7 . Identify each of the reactions in the transformation below as oxidative addition, reductive elimination, ligand dissociation, etc. Some of the reactions are not the elementary steps. For those processes show each step....
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