Ch.7 - Covalent Bonding and Electron-Dot Structures
Chapter 7, Problem 110
Propose structures for molecules that meet the following descriptions. (b) Contains an N atom that has one p bond and two s bonds
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Related Practice
Textbook Question
Use the following information plus the data given in Tables 6.2 and 6.3 to calculate the second electron affinity, Eea2, of oxygen. Is the O2-ion stable in the gas phase? Why is it stable in solid MgO?
Heat of sublimation for Mg1s2 = +147.7 kJ/mol
Bond dissociation energy for O21g2 = +498.4 kJ/mol
Eea1 for O1g2 = -141.0 kJ/mol
Net energy change for formation of MgO(s) from its elements = -601.7 kJ/mol
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Textbook Question
Assign formal charges to the atoms in the following structures. Which of the two do you think is the more important contributor to the resonance hybrid?(a)(b)
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Textbook Question
Draw the resonance structure indicated by the curved arrows. Assign formal charges, and evaluate which of the two structures is a larger contributor to the resonance hybrid.
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Textbook Question
In the cyanate ion, OCN-, carbon is the central atom.
(b) Which resonance structure makes the greatest contribution
to the resonance hybrid? Which makes the least
contribution? Explain.
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Textbook Question
The dichromate ion, Cr2O72-, has neither Cr¬Cr nor
O¬O bonds.
(a) Taking both 4s and 3d electrons into account, draw an
electron-dot structure that minimizes the formal charges
on the atoms.
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Textbook Question
Calculate an approximate heat of combustion for ethane (C2H6) in kilojoules by using the bond dissocation energies in Table 9.3. (The strength of the O'O bond is 498 kJ/ mol, and that of a C ' O bond in CO2 is 804 kJ/mol.)
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