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Chem_173B_HW4_2008 - Chem 173B/268B Homework assignment#4...

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Unformatted text preview: Chem 173B/268B Homework assignment #4 Prof. S. Scott Due Monday, March 10, in class 1. (a) Explain why NF 3 (bp -129 °C) is more volatile than NH3 (bp -33 °C). (b) Explain why NH 3 is a much stronger base than NF 3 . 2. Cyanogen, (CN) 2 , is called a pseudohalide because its chemistry closely resembles that of the group 17 elements. Using this analogy, predict: (a) what happens when Cl 2 (g) is bubbled through an aqueous cyanide solution (b) what happens when cyanogen gas is bubbled through water. 3. Use VSEPR to predict the structures of (a) SbCl 5 (b) FClO 3 (c) [ClF 6 ] + (d) XeO 2 F 2 4. Explain why chromate (CrO 4 2- ) is a stronger oxidant than molybdate (MoO 4 2- ). 5. Predict the cluster geometry for (a) Os6(CO)182- (b) Mo 2 Ni 3 (CO) 16 2- 6. Recently, Power et al. reported the first-ever compound containing a quintuple bond, ( Science , 2005, 310 , 844). The abstract is shown below: Synthesis of a Stable Compound with Fivefold Bonding Between Two Chromium(I) Centers, Tailuan...
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