EBK CHEMISTRY
4th Edition
ISBN: 8220102797864
Author: Burdge
Publisher: YUZU
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Textbook Question
Chapter 8, Problem 78QP
What is bond enthalpy? Bond enthalpies of polyatomic molecules are average values, whereas those of diatomic molecules can be accurately determined. Why?
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A certain element X forms two compounds with hydrogen, XH3 and X2H4 (H2X–XH2). The total bond enthalpies of XH3(g) and X2H4(g) are 846 kJ/mol and 1341 kJ/mol, respectively. What is the average bond enthalpy of the X–X bond?
Define the terms bond enthalpy and mean bond enthalpy.Use examples to illustrate the difference between the two quantities.
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…
Chapter 8 Solutions
EBK CHEMISTRY
Ch. 8.1 - Practice ProblemATTEMPT Write Lewis dot symbols...Ch. 8.1 - Practice Problem BUILD
Indicate the charge on...Ch. 8.1 - Practice ProblemCONCEPTUALIZE For each of the...Ch. 8.1 - 8.1.1 Using only a periodic table, determine the...Ch. 8.1 - 8.1.2 Using only a periodic table, determine the...Ch. 8.1 - To which group does element X belong if its Lewis...Ch. 8.1 - Prob. 4CPCh. 8.2 - Prob. 1PPACh. 8.2 - Practice ProblemBUILD Arrange the compounds NaF,...Ch. 8.2 - Practice ProblemCONCEPTUALIZE Common ions of four...
Ch. 8.2 - 8.2.1 Will the lattice energy of KF be larger or...Ch. 8.2 - 8.2.2 Using the following data, calculate the...Ch. 8.2 - 8.2.3 Lattice energies are graphed for three...Ch. 8.3 - Practice ProblemATTEMPT Using data from Figures...Ch. 8.3 - Prob. 1PPBCh. 8.3 - Prob. 1PPCCh. 8.4 - Practice Problem ATTEMPT Classify the following...Ch. 8.4 - Prob. 1PPBCh. 8.4 - Prob. 1PPCCh. 8.4 - In which of the following molecules are the bonds...Ch. 8.4 - Using data from Table 8.5, calculate the magnitude...Ch. 8.4 - Prob. 3CPCh. 8.4 - Prob. 4CPCh. 8.5 - Prob. 1PPACh. 8.5 - Prob. 1PPBCh. 8.5 - Prob. 1PPCCh. 8.5 - Identify the correct Lewis structure for formic...Ch. 8.5 - Identity the correct Lewis structure for hydrogen...Ch. 8.6 - Prob. 1PPACh. 8.6 - Prob. 1PPBCh. 8.6 - Prob. 1PPCCh. 8.6 - Determine the formal charges on H, C, and N,...Ch. 8.6 - 8.6.2 Which of the Lewis structures shown is most...Ch. 8.7 - Prob. 1PPACh. 8.7 - Practice ProblemBUILD Draw the Lewis structure for...Ch. 8.7 - Practice Problem CONCEPTUALIZE
Of the three Lewis...Ch. 8.7 - Indicate which of the following are resonance...Ch. 8.7 - 8.7.2 How many resonance structures can be drawn...Ch. 8.8 - Prob. 1PPACh. 8.8 - Prob. 1PPBCh. 8.8 - Practice Problem CONCEPTUALIZE
The hypothetical...Ch. 8.8 - In which of the following species does the central...Ch. 8.8 - Prob. 2CPCh. 8.8 - In which species does the central atom obey the...Ch. 8.8 - 8.8.4 How many lone pairs are there on the central...Ch. 8.9 - Prob. 1PPACh. 8.9 - Practice ProblemBUILD Use Lewis structures and...Ch. 8.9 - Prob. 1PPCCh. 8.9 - 8.9.1 Use data from Table 8.6 to estimate for the...Ch. 8.9 - Use data from Table 8.6 to estimate Δ H rxn for...Ch. 8.9 - Use bond enthalpies to determine Δ H rxn for the...Ch. 8.9 - Prob. 4CPCh. 8.10 - Practice ProblemATTEMPT Draw all possible...Ch. 8.10 - Prob. 1PPBCh. 8.10 - Practice ProblemCONCEPTUALIZE The Lewis structure...Ch. 8.11 - Prob. 1PPACh. 8.11 - Prob. 1PPBCh. 8.11 - Prob. 1PPCCh. 8.12 - Prob. 1PPACh. 8.12 - Prob. 1PPBCh. 8.12 - Prob. 1PPCCh. 8.13 - Prob. 1PPACh. 8.13 - Practice Problem BUILD
Using the following...Ch. 8.13 - Prob. 1PPCCh. 8 - 8.1
Which of the following atoms must always obey...Ch. 8 - Prob. 2KSPCh. 8 - Prob. 3KSPCh. 8 - Prob. 4KSPCh. 8 - What is a Lewis dot symbol? What elements do we...Ch. 8 - Use the second member of each group from Group 1A...Ch. 8 - Prob. 3QPCh. 8 - 8.4 Write Lewis dot symbols for the following...Ch. 8 - Write Lewis dot symbols for the following atoms...Ch. 8 - Prob. 6QPCh. 8 - Prob. 7QPCh. 8 - Name five metals and five nonmetals that are very...Ch. 8 - Prob. 9QPCh. 8 - Prob. 10QPCh. 8 - Prob. 11QPCh. 8 - The term molar mass was introduced in Chapter 3....Ch. 8 - Prob. 13QPCh. 8 - Prob. 14QPCh. 8 - Prob. 15QPCh. 8 - Explain how the lattice energy of an ionic...Ch. 8 - Prob. 17QPCh. 8 - Prob. 18QPCh. 8 - 8.19 Use the Born-Haber cycle outlined in Section...Ch. 8 - Calculate the lattice energy of CaCl 2 . Use data...Ch. 8 - An ionic bond is formed between a cation A + and...Ch. 8 - Prob. 22QPCh. 8 - Use Lewis dot symbols to show the transfer of...Ch. 8 - Write the Lewis dot symbols of the reactants and...Ch. 8 - 8.25 Describe Lewis’s contribution to our...Ch. 8 - Prob. 26QPCh. 8 - Prob. 27QPCh. 8 - Prob. 28QPCh. 8 - Prob. 29QPCh. 8 - Prob. 30QPCh. 8 - Prob. 31QPCh. 8 - Prob. 32QPCh. 8 - Prob. 33QPCh. 8 - Define electronegativity, and explain the...Ch. 8 - Prob. 35QPCh. 8 - Prob. 36QPCh. 8 - Prob. 37QPCh. 8 - Using information in Table 8.5. calculate the...Ch. 8 - List the following bonds in order of increasing...Ch. 8 - Classify the following bonds as covalent, polar...Ch. 8 - 8.41 Classify the following bonds as covalent,...Ch. 8 - 8.42 List the following bonds in order of...Ch. 8 - Prob. 43QPCh. 8 - Prob. 44QPCh. 8 - Prob. 45QPCh. 8 - Prob. 46QPCh. 8 - Draw Lewis structures for the following molecules...Ch. 8 - Draw Lewis structures for the following molecules:...Ch. 8 - Prob. 49QPCh. 8 - Prob. 50QPCh. 8 - 8.51 Draw Lewis structures for the following ions:...Ch. 8 - Draw Lewis structures for the following ions: (a)...Ch. 8 - Prob. 53QPCh. 8 - Prob. 54QPCh. 8 - Prob. 55QPCh. 8 - Prob. 56QPCh. 8 - Prob. 57QPCh. 8 - 8.58 Draw three resonance structures for the...Ch. 8 - Prob. 59QPCh. 8 - Prob. 60QPCh. 8 - Draw three reasonable resonance structures for the...Ch. 8 - Draw three resonance structures for the molecule N...Ch. 8 - Prob. 63QPCh. 8 - Prob. 64QPCh. 8 - Prob. 65QPCh. 8 - Prob. 66QPCh. 8 - Prob. 67QPCh. 8 - Prob. 68QPCh. 8 - Prob. 69QPCh. 8 - The AlI 3 molecule has an incomplete octet around...Ch. 8 - Prob. 71QPCh. 8 - Prob. 72QPCh. 8 - 8.73 Write a Lewis structure for Does this...Ch. 8 - Prob. 74QPCh. 8 - Prob. 75QPCh. 8 - 8.76 Draw two resonance structures for the bromate...Ch. 8 - Prob. 77QPCh. 8 - What is bond enthalpy? Bond enthalpies of...Ch. 8 - Prob. 79QPCh. 8 - Prob. 80QPCh. 8 - Prob. 81QPCh. 8 - Prob. 82QPCh. 8 - For the reaction 2 C 2 H 6 ( g ) + 7 O 2 ( g ) → 4...Ch. 8 - Prob. 84QPCh. 8 - 8.85. Use average bond enthalpies from Table 8.6...Ch. 8 - Prob. 86APCh. 8 - Prob. 87APCh. 8 - Prob. 88APCh. 8 - Prob. 89APCh. 8 - Prob. 90APCh. 8 - 8.91 Describe some characteristics of an ionic...Ch. 8 - Prob. 92APCh. 8 - Prob. 93APCh. 8 - Prob. 94APCh. 8 - Prob. 95APCh. 8 - Prob. 96APCh. 8 - Prob. 97APCh. 8 - Prob. 98APCh. 8 - Prob. 99APCh. 8 - Prob. 100APCh. 8 - Prob. 101APCh. 8 - Prob. 102APCh. 8 - Prob. 103APCh. 8 - Prob. 104APCh. 8 - Which of the following species are isoelectronic:...Ch. 8 - Prob. 106APCh. 8 - 8.107 Draw two resonance structures for each...Ch. 8 - The following species have been detected in...Ch. 8 - The amide ion ( NH 2 − ) is a Brø�nsted base. Use...Ch. 8 - Prob. 110QPCh. 8 - The triiodide ion ( I 3 − ) in which the I atoms...Ch. 8 - Prob. 112APCh. 8 - In 1999, an unusual cation containing only...Ch. 8 - Prob. 114APCh. 8 - Prob. 115APCh. 8 - Prob. 116APCh. 8 - In the gas phase, aluminum chloride exists as a...Ch. 8 - Prob. 118APCh. 8 - Calculate Δ H º for the reaction H 2 ( g ) + I 2 (...Ch. 8 - Draw Lewis structures for the following organic...Ch. 8 - Prob. 121APCh. 8 - Prob. 122APCh. 8 - Prob. 123APCh. 8 - Write three resonance structures for (a) the...Ch. 8 - Prob. 125APCh. 8 - Prob. 126APCh. 8 - Prob. 127APCh. 8 - Prob. 128APCh. 8 - Prob. 129APCh. 8 - Prob. 130APCh. 8 - Prob. 131APCh. 8 - Among the common inhaled anesthetics are:...Ch. 8 - Prob. 133QPCh. 8 - Prob. 134QPCh. 8 - Prob. 135QPCh. 8 - 8.136 Using this and data from Appendix 2,...Ch. 8 - Prob. 137QPCh. 8 - Prob. 138APCh. 8 - Prob. 139APCh. 8 - Prob. 140APCh. 8 - Prob. 141APCh. 8 - Prob. 142APCh. 8 - Prob. 143APCh. 8 - Although nitrogen dioxide ( NO 2 ) is a stable...Ch. 8 - 8.145 The chlorine nitrate molecule is believed...Ch. 8 - The hydroxyl radical ( OH ) plays an important...Ch. 8 - Prob. 147APCh. 8 - Prob. 148APCh. 8 - Prob. 1SEPPCh. 8 - 2. Use formal charges to choose the best of the...Ch. 8 - Prob. 3SEPPCh. 8 - Prob. 4SEPP
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- Bond 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_forwardhat is the enthalpy change for a process? Is enthalpy a state function? In what experimental apparatus are enthalpy changes measured?arrow_forwardWhich statement(s) is/are true about bond enthalpy? (a) The bond energy for a triple bond between A and B is three times that of a single bond between A and B. (b) H for the breaking of a bond is always a negative number. (c) Energy is required to make a bond. (d) Bond enthalpy is defined only for bonds broken or formed in the gaseous state. (e) The presence of bonds does not influence the geometry of a molecule. However, the presence of bonds affects the value of the bond enthalpy between two atoms.arrow_forward
- Using the standard enthalpy of formation data in Appendix G, show how the standard enthalpy of formation of HCl(g) can be used to determine the bond energy.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_forwardhat does temperature measure? Are the molecules in a beaker of warm water moving at the same speed as the molecules in a beaker of cold water? Explain? What is heat? Is heat the same as temperature?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_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_forwardUsing bond enthalpies from your reference page, how much energy is stored in 1 mol of HCN?arrow_forward
- 4. The standard enthalpies of formation of SO(g), S(g) and O(g) are -359.7, +2788 and +249.0 kJ mol, respectively. Use these data to calculate the average bond energy (in kJ mol ¹) of the S-O double bond. A) +297.9 B) +325.0 C) -461.8 D) +461.8 E) +317.8arrow_forwardDefine the term lattice energy?arrow_forwardThe table below includes the bond enthalpy (the energy required to separate the diatomic molecule into its atoms) and the bond length for each diatomic molecule. Diatomic Molecule Bond Enthalpy (kJ/mol) Bond Length (pm) Cl2 243 199 O2 498 121 N2 945 110 Identify the observed trend between bond enthalpy and number of shared electrons: as the number of electrons shared between two atoms increases, the bond enthalpy ( increases / decreases / remains unchanged ). Identify the observed trend between bond length and number of shared electrons: as the number of electrons shared between two atoms increases, the bond length ( increases / decreases / remains unchanged ).arrow_forward
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