Vanadium(V) fluoride is a colorless substance that melts at 19.5 'C and boils at 48.3

Chapter 23, Problem 23.83

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Vanadium(V) fluoride is a colorless substance that melts at 19.5 'C and boils at 48.3 'C. Vanadium(TIJ) fluoride, on the other hand, is yellow-green in color and melts at 800 'C. (a) Suggest a structure and bonding for VF5 that accounts for its melting and boiling points. Can you identify a compound of a nonmetallic element that probably has the same structure? (b) VF3 is prepared by the action of HF on heated VCl3. Write a balanced equation for this reaction. (c) While VF5 is a known compound, the other vanadium(V) halides are unknown. Suggest why these compounds might be unstable. (Hint: The reasons might have to do with both size and electronic factors.)

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