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Chemistry / Chemistry: A Molecular Approach 3 / Chapter 9 / Problem 97E

Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro

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The cyanate ion (OCN-) and the fulminate ion (CNO-) share

Chapter 9, Problem 97E

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QUESTION:

The cyanate ion (OCN-) and the fulminate ion (CNO-) share the same three atoms but have vastly different properties. The cyanate ion is stable, while the fulminate ion is unstable and forms explosive compounds. The resonance structures of the cyanate ion were explored in Example 9.8 . Draw Lewis structures for the fulminate ion—including possible resonance forms—and use formal charge to explain why the fulminate ion is less stable (and therefore more reactive) than the cyanate ion.

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QUESTION:

The cyanate ion (OCN-) and the fulminate ion (CNO-) share the same three atoms but have vastly different properties. The cyanate ion is stable, while the fulminate ion is unstable and forms explosive compounds. The resonance structures of the cyanate ion were explored in Example 9.8 . Draw Lewis structures for the fulminate ion—including possible resonance forms—and use formal charge to explain why the fulminate ion is less stable (and therefore more reactive) than the cyanate ion.

ANSWER:

Solution 97 E Step 1 of 2 The most likely form for cyanate ion is the one indicated below In fact If we calculate Formal charge for each atom For C Valence electrons - Lone pair electrons - ½ bondin electrons= 4-0-4= 0 For O Valence electrons - Lone pair electrons - ½ bondin electrons= 6-6-1=-1 For N Valence electrons - Lone pair electrons - ½ bondin electrons= 5-2-3=0 O carries the(-) charge and it’s the most electronegative atom

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