Chemistry: Structure and Properties Custom Edition for Rutgers University General Chemistry
15th Edition
ISBN: 9781269935678
Author: Nivaldo J. Tro
Publisher: Pearson Education
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Textbook Question
Chapter 6, Problem 83E
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 5.6. 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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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 are 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.
In chemical reactions, heat is converted into chemical energy (the potential energy stored
in chemical bonds) or vice versa. Bond energy is the energy required to break one mole of
the bond in the gas phase. Since it takes energy to break a bond, bond energies are
always positive. Conversely, energy is released when bonds are formed. Thus, the
enthalpy change for a reaction can be approximated from
Part A
Calculate the bond energy per mole for breaking all the bonds in methane, CH4.
ΔΗ
Σ(ΔΗ breaking) + Σ(ΔΗ forming)
Express your answer to four significant figures and include the appropriate units.
where H represents bond energies for the breaking (positive bond energy) or forming
(negative bond energy) of a bond and Hrxn represents the overall enthalpy for the
• View Available Hint(s)
reaction.
Use the table to answer questions about bond energies.
HẢ
Bond energy
Bond
(kJ/mol )
Value
Units
AHCH, =
C-C
347
C=C
611
Submit
Сн
414
C-O
360
Part B
C=OinCO2
799
O-0
142
Calculate the bond…
Use the References to access important values if needed for this question.
Use average bond enthalpies (linked above) to calculate the enthalpy change for the following gas-phase reaction.
CH3OH(g) + HI(g) - CH31(g) + H₂O(g)
To analyze the reaction, first draw Lewis structures for all reactant and product molecules.
• Draw the reaction using separate sketchers for each species.
●
Separate multiple reactants and/or products using the + sign from the drop-down arrow.
●
Separate reactants from products using the → symbol from the drop-down menu.
• Remember to include nonbonding valence electrons in your Lewis structures.
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Chapter 6 Solutions
Chemistry: Structure and Properties Custom Edition for Rutgers University General Chemistry
Ch. 6 - Which set of elements is arranged in order of...Ch. 6 - Prob. 2SAQCh. 6 - Which pair of atoms forms the most polar bond? C...Ch. 6 - Which pair of atoms forms a nonpolar covalent...Ch. 6 - Prob. 5SAQCh. 6 - Prob. 6SAQCh. 6 - Prob. 7SAQCh. 6 - Prob. 8SAQCh. 6 - Prob. 9SAQCh. 6 - Prob. 10SAQ
Ch. 6 - Prob. 11SAQCh. 6 - Predict the relative bond angles in BF3 and SO2Ch. 6 - Predict the molecular geometry about N in the...Ch. 6 - Which molecule is polar?Ch. 6 - What is electronegativity? What are the periodic...Ch. 6 - Explain the difference between a pure covalent...Ch. 6 - What is meant by the percent ionic character of a...Ch. 6 - Prob. 4ECh. 6 - What is the magnitude of the dipole moment formed...Ch. 6 - What is the basic procedure for writing a covalent...Ch. 6 - How do you determine the number of electrons that...Ch. 6 - What are resonance structures? What is a resonance...Ch. 6 - Prob. 9ECh. 6 - Prob. 10ECh. 6 - Prob. 11ECh. 6 - Prob. 12ECh. 6 - What is bond energy?Ch. 6 - Give some examples of some typical bond lengths....Ch. 6 - Why is molecular geometry important? Cite some...Ch. 6 - According to VSEPR theory, what determines the...Ch. 6 - Name and draw the five basic electron geometries,...Ch. 6 - Explain the difference between electron geometry...Ch. 6 - List the correct electron and molecular geometries...Ch. 6 - How do you apply VSEPR theory to predict the shape...Ch. 6 - How do you determine if a molecule is polar?Ch. 6 - Why is polarity a key connection between the...Ch. 6 - Prob. 23ECh. 6 - Determine if a bond between each pair of atoms...Ch. 6 - Prob. 25ECh. 6 - Draw the Lewis structure for BrF with an arrow...Ch. 6 - Prob. 27ECh. 6 - Write the Lewis structure for each molecule. NF3...Ch. 6 - Prob. 29ECh. 6 - Write the Lewis structure for each molecule. CH2O...Ch. 6 - Prob. 31ECh. 6 - Prob. 32ECh. 6 - Write the Lewis structure for each molecule or ion...Ch. 6 - Prob. 34ECh. 6 - Write a Lewis structure that obeys the octet rule...Ch. 6 - Prob. 36ECh. 6 - Use formal charge to determine which Lewis...Ch. 6 - Prob. 38ECh. 6 - How important is this resonance structure to the...Ch. 6 - Prob. 40ECh. 6 - Prob. 41ECh. 6 - Prob. 42ECh. 6 - Determine the formal charges of the atoms shown in...Ch. 6 - Prob. 44ECh. 6 - Prob. 45ECh. 6 - Write the Lewis structure for each molecule (octet...Ch. 6 - Prob. 47ECh. 6 - Write Lewis structures for each molecule or ion....Ch. 6 - Prob. 49ECh. 6 - Write Lewis structures for each molecule or ion....Ch. 6 - List these compounds in order of increasing...Ch. 6 - Which of these compounds has the stronger...Ch. 6 - A molecule with the formula AB3 has a trigonal...Ch. 6 - A molecule with the formula AB3 has a trigonal...Ch. 6 - For each molecular geometry shown here, list the...Ch. 6 - For each molecular geometry shown here, list the...Ch. 6 - Determine the electron geometry, molecular...Ch. 6 - Determine the electron geometry, molecular...Ch. 6 - Which species has the smaller bond angle, H3O+ or...Ch. 6 - Which species has the smaller bond angle; C1O4- or...Ch. 6 - Determine the molecular geometry and draw each...Ch. 6 - Determine the molecular geometry and draw each...Ch. 6 - Determine the molecular geometry about each...Ch. 6 - Prob. 64ECh. 6 - Prob. 65ECh. 6 - Prob. 66ECh. 6 - Prob. 67ECh. 6 - Determine the geometry about each interior atom in...Ch. 6 - Explain why CO2 and CCl4 are both nonpolar even...Ch. 6 - CH3F is a polar molecule, even though the...Ch. 6 - Determine whether each molecule in Exercise 57 is...Ch. 6 - Prob. 72ECh. 6 - Determine whether each molecule or ion is polar or...Ch. 6 - Determine whether each molecule is polar or...Ch. 6 - Each compound contains both ionic and covalent...Ch. 6 - Prob. 76ECh. 6 - Carbon ring structures are common in organic...Ch. 6 - Prob. 78ECh. 6 - Prob. 79ECh. 6 - Diazomethane is a highly poisonous, explosive...Ch. 6 - Prob. 81ECh. 6 - Phosgene (Cl2CO) is a poisonous gas that was used...Ch. 6 - The cyanate ion (OCN-) and the fulminate ion...Ch. 6 - Prob. 84ECh. 6 - Prob. 85ECh. 6 - Prob. 86ECh. 6 - Prob. 87ECh. 6 - Prob. 88ECh. 6 - Prob. 89ECh. 6 - Free radicals are important in many...Ch. 6 - A compound composed of only carbon and hydrogen is...Ch. 6 - A compound composed of only carbon and chlorine is...Ch. 6 - Prob. 93ECh. 6 - The genetic code is based on four different bases...Ch. 6 - Prob. 95ECh. 6 - Prob. 96ECh. 6 - Prob. 97ECh. 6 - A 0.167-g sample of an unknown compound contains...Ch. 6 - Use the dipole moments of HF and HCI (given at the...Ch. 6 - One form of phosphorus exists as P4 molecules....Ch. 6 - A compound has the formula C8H8 and does not...Ch. 6 - Prob. 102ECh. 6 - The bond angles increase steadily in the series...Ch. 6 - Draw the Lewis structure for acetamide (CH3CONH2),...Ch. 6 - Prob. 105ECh. 6 - In the very first chapter of this book, we...Ch. 6 - Which statement best captures the fundamental idea...Ch. 6 - Prob. 108E
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- Draw resonance structures for each of these ions: NSO− and SNO−. (The atoms are bonded in the order given in each case, that is, S is the central atom in NSO−.) Use formal charges to determine which ion is likely to be more stable. Explain why the two ions cannot be considered resonance structures of each other.arrow_forwardBond Enthalpy When atoms of the hypothetical element X are placed together, they rapidly undergo reaction to form the X2 molecule: X(g)+X(g)X2(g) a Would you predict that this reaction is exothermic or endothermic? Explain. b Is the bond enthalpy of X2 a positive or a negative quantity? Why? c Suppose H for the reaction is 500 kJ/mol. Estimate the bond enthalpy of the X2 molecule. d Another hypothetical molecular compound, Y2(g), has a bond enthalpy of 750 kJ/mol, and the molecular compound XY(g) has a bond enthalpy of 1500 kJ/mol. Using bond enthalpy information, calculate H for the following reaction. X2(g)+Y2(g)2XY(g) e Given the following information, as well as the information previously presented, predict whether or not the hypothetical ionic compound AX is likely to form. In this compound, A forms the A+ cation, and X forms the X anion. Be sure to justify your answer. Reaction: A(g)+12X2(g)AX(s)The first ionization energy of A(g) is 400 kJ/mol. The electron affinity of X(g) is 525 kJ/mol. The lattice energy of AX(s) is 100 kJ/mol. f If you predicted that no ionic compound would form from the reaction in Part e, what minimum amount of AX(s) lattice energy might lead to compound formation?arrow_forwardCompare your answers from parts a and b of Exercise 69 of Chapter 3 with H values calculated for each reaction using standard enthalpies of formation in Appendix 4. Do enthalpy changes calculated from bond energies give a reasonable estimate of the actual values?arrow_forward
- Write the Lewis structure for nitrosyl fluoride, FNO. Using only a periodic table, identify (a) which is the longer bond. (b) which is the stronger bond. (c) which is the more polar bond.arrow_forwardthe formal charges on all the atoms in the following Lewis diagrams. Which one would best represent bonding in the molecule Cl2O ?arrow_forwardMethylcyanoacrylate is the active ingredient in super glues. Its Lewis structure is In this molecule, which is the (a) weakest carbon-containing bond? (b) strongest carbon-containing bond? (c) most polar bond?arrow_forward
- Sulfur and oxygen form a series of 2 anions including sulfite, SO32, and sulfate, SO42. In addition to these, there are three other more complex anionsdithionite, S2O42, dithionate, S2O62, and tetrathionate, S4O62. Write correct Lewis structures for dithionite, dithionate, and tetrathionate ions.arrow_forwardWrite the Lewis structure and chemical formula of the compound with a molar mass of about 70 g/mol that contains 19.7% nitrogen and 80.3% fluorine by mass, and determine the formal charge of the atoms in this compound.arrow_forwardDraw a curve that describes the energy of a system with H and Cl atoms at varying distances. Then, find the minimum energy of this curve two ways. (a) Use the bond energy found in Table 8.1 to calculate the energy for one single HCl bond (Hint: How many bonds are in a mole?) (b) Use the enthalpy of reaction and the bond energies for H2 and Cl2 to solve for the energy of one mole of HCl bonds. H2(g)+Cl2(g)2HCl(g)Hrxn=184.7kJ/molarrow_forward
- In the Lewis structure for chloromethane, the chlorine atom is sharing _____ electron pair and “owns” _____ of those electrons. Also, the chlorine atom possesses two electrons from each of _____ unshared pairs. The total number of electrons that belong to chlorine is 7 . Chlorine is a Group ____ element. The formal charge on chlorine in chloromethane is ____.arrow_forwardEstimate the enthalpy change (AH) of the following reaction using the average bond energies in the table below. *Hint: Draw out the structures to see how the atoms bond!* Reaction: 2C2H6 + 702 → 4CO2 + 6H2O Bond Energies: 436 kJ/mol 431 kJ/mol 413 kJ/mol C=C C=C C=0 614 kJ/mol 839 kJ/mol 799 kJ/mol 495 kJ/mol 1072 kJ/mol 615 kJ/mol H-H С-Н H-CI C-C 348 kJ/mol 293 kJ/mol 358 kJ/mol HF 567 kJ/mol C-N N-H 391 kJ/mol C-O O=0 N-O 201 kJ/mol C-F C-CI 485 kJ/mol C=0 463 kJ/mol 328 kJ/mol C=N 146 kJ/mol C-S 259 k/mol N=N 418 kJ/mol F-F 155 kJ/mol CI-CI 242 kJ/mol N=N 941 kJ/mol 891 kJ/mol C=N - 9117 kJ - 2831 kJ 11968 kJ 2518 kJ 312 kJarrow_forward
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