Chemistry: The Molecular Science
5th Edition
ISBN: 9781285199047
Author: John W. Moore, Conrad L. Stanitski
Publisher: Cengage Learning
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Textbook Question
Chapter 6, Problem 33QRT
Which bond requires more energy to break: the carbon-oxygen bond in formaldehyde, H2CO, or the carbon-oxygen bond in carbon monoxide, CO?
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Covalent bonds: H―HC―HO―HO═O C≡O Bond energy (kJ/mol):4364154654981080Calculate the enthalpy change (H, in kJ/mol) for the following reaction and indicate whether the reaction is exothermic or endothermic.(*BE for C═Oin CO2)(a) CH4(g)+ H2O(g)CO(g)+ 3H2(g);
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…
How many grams of CO2 are produced when C3H8 is combusted in oxygen and 507.0 kJ of heat are released? Estimate ΔHrxn using bond enthalpies from the table above in order to solve this problem.
Bond
Bond Energy (kJ/mol)
Bond
Bond Energy (kJ/mol)
C-C
347
C=O (in CO2)
799
C=C
614
C=O
745
C≡C
839
C≡O
1070
C-H
413
O=O
498
O-H
467
N-H
391
H-H
432
N≡N
945
C-O
358
N-Cl
200
C-N
305
N-O
201
C-Cl
339
C≡N
891
Chapter 6 Solutions
Chemistry: The Molecular Science
Ch. 6.2 - Write Lewis structures for (a) NF3, (b) N2H4, and...Ch. 6.3 - Prob. 6.1ECh. 6.3 - Prob. 6.2PSPCh. 6.4 - Prob. 6.2CECh. 6.4 - Write Lewis structures for (a) nitrosyl ion, NO+;...Ch. 6.5 - Prob. 6.4CECh. 6.5 - Prob. 6.5CECh. 6.5 - Prob. 6.4PSPCh. 6.6 - Prob. 6.5PSPCh. 6.6 - Use Equation 6.1 and values from Table 6.2 to...
Ch. 6.6 - Prob. 6.6CECh. 6.7 - Prob. 6.7PSPCh. 6.7 - Prob. 6.7CECh. 6.8 - Prob. 6.8PSPCh. 6.9 - Prob. 6.9PSPCh. 6.9 - Prob. 6.9CECh. 6.10 - Prob. 6.10PSPCh. 6.11 - Prob. 6.10ECh. 6.11 - Prob. 6.11ECh. 6.11 - Prob. 1CECh. 6.11 - Prob. 2CECh. 6.12 - Repeat Problem-Solving Example 6.11, but use N2...Ch. 6.12 - Use MO theory to predict the bond order and the...Ch. 6 - Prob. 1QRTCh. 6 - Prob. 2QRTCh. 6 - Prob. 3QRTCh. 6 - Prob. 4QRTCh. 6 - Prob. 5QRTCh. 6 - Prob. 6QRTCh. 6 - Which of these molecules have an odd number of...Ch. 6 - Prob. 8QRTCh. 6 - Prob. 9QRTCh. 6 - Prob. 10QRTCh. 6 - Prob. 11QRTCh. 6 - Prob. 12QRTCh. 6 - Explain in your own words why the energy of two H...Ch. 6 - Prob. 14QRTCh. 6 - Prob. 15QRTCh. 6 - Prob. 16QRTCh. 6 - Prob. 17QRTCh. 6 - Prob. 18QRTCh. 6 - Prob. 19QRTCh. 6 -
Write Lewis structures for
tetracyanoethene,...Ch. 6 - Prob. 21QRTCh. 6 - Prob. 22QRTCh. 6 - Prob. 23QRTCh. 6 - Prob. 24QRTCh. 6 - Prob. 25QRTCh. 6 - Prob. 26QRTCh. 6 - Prob. 27QRTCh. 6 - Prob. 28QRTCh. 6 - Prob. 29QRTCh. 6 - For each pair of bonds, predict which is the...Ch. 6 - Prob. 31QRTCh. 6 - Prob. 32QRTCh. 6 - Which bond requires more energy to break: the...Ch. 6 -
Estimate ΔrH° for forming 2 mol ammonia from...Ch. 6 - Prob. 35QRTCh. 6 - Light of appropriate wavelength can break chemical...Ch. 6 - Prob. 37QRTCh. 6 - Prob. 38QRTCh. 6 - Prob. 39QRTCh. 6 - Acrolein is the starting material for certain...Ch. 6 - Prob. 41QRTCh. 6 - Prob. 42QRTCh. 6 - Write the correct Lewis structure and assign a...Ch. 6 - Prob. 44QRTCh. 6 - Prob. 45QRTCh. 6 - Two Lewis structures can be written for nitrosyl...Ch. 6 - Prob. 47QRTCh. 6 - Prob. 48QRTCh. 6 - Prob. 49QRTCh. 6 - Prob. 50QRTCh. 6 - Several Lewis structures can be written for...Ch. 6 - Prob. 52QRTCh. 6 - Prob. 53QRTCh. 6 - Prob. 54QRTCh. 6 - Prob. 55QRTCh. 6 - Draw resonance structures for each of these ions:...Ch. 6 - Three known isomers exist of N2CO, with the atoms...Ch. 6 - Write the Lewis structure for (a) BrF5 (b) IF5 (c)...Ch. 6 - Write the Lewis structure for
BrF3
XeF4
Ch. 6 - Prob. 60QRTCh. 6 - Prob. 61QRTCh. 6 - Prob. 62QRTCh. 6 - All carbon-to-carbon bond lengths are identical in...Ch. 6 - Prob. 64QRTCh. 6 - Prob. 65QRTCh. 6 - Prob. 66QRTCh. 6 - Prob. 67QRTCh. 6 - Prob. 68QRTCh. 6 - Prob. 69QRTCh. 6 - Prob. 70QRTCh. 6 - Using just a periodic table (not a table of...Ch. 6 - The CBr bond length in CBr4 is 191 pm; the BrBr...Ch. 6 - Prob. 73QRTCh. 6 -
Acrylonitrile is the building block of the...Ch. 6 - Prob. 75QRTCh. 6 - Write Lewis structures for (a) SCl2 (b) Cl3+ (c)...Ch. 6 - Prob. 77QRTCh. 6 - Prob. 78QRTCh. 6 - A student drew this incorrect Lewis structure for...Ch. 6 - This Lewis structure for SF5+ is drawn...Ch. 6 - Tribromide, Br3, and triiodide, I3, ions are often...Ch. 6 - Explain why nonmetal atoms in Period 3 and beyond...Ch. 6 - Prob. 83QRTCh. 6 - Prob. 84QRTCh. 6 - Prob. 85QRTCh. 6 - Prob. 86QRTCh. 6 - Which of these molecules is least likely to exist:...Ch. 6 - Write the Lewis structure for nitrosyl fluoride,...Ch. 6 - Prob. 91QRTCh. 6 - Methylcyanoacrylate is the active ingredient in...Ch. 6 - Aspirin is made from salicylic acid, which has...Ch. 6 - Prob. 94QRTCh. 6 - Prob. 95QRTCh. 6 - Prob. 96QRTCh. 6 - Prob. 97QRTCh. 6 - Prob. 98QRTCh. 6 - Nitrosyl azide, N4O, is a pale yellow solid first...Ch. 6 - Write the Lewis structures for (a) (Cl2PN)3 (b)...Ch. 6 - Nitrous oxide, N2O, is a linear molecule that has...Ch. 6 - The azide ion, N3, has three resonance hybrid...Ch. 6 - Hydrazoic acid, HN3, has three resonance hybrid...Ch. 6 - Prob. 104QRTCh. 6 - Experimental evidence indicates the existence of...Ch. 6 - Prob. 106QRTCh. 6 - Prob. 107QRTCh. 6 - Pipeline, the active ingredient in black pepper,...Ch. 6 - Sulfur and oxygen form a series of 2 anions...Ch. 6 - Prob. 110QRTCh. 6 - Prob. 111QRTCh. 6 - Prob. 112QRTCh. 6 - Prob. 113QRTCh. 6 - Prob. 114QRTCh. 6 - Prob. 115QRTCh. 6 - Prob. 116QRTCh. 6 - Prob. 117QRTCh. 6 - Prob. 118QRTCh. 6 - Prob. 6.ACPCh. 6 - Prob. 6.BCPCh. 6 - Prob. 6.CCP
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- Write all resonance structures of chlorobenzene, C6H5Cl, a molecule with the same cyclic structure as benzene. In all structures, keep the CCl bond as a single bond. Which resonance structures are the most important?arrow_forwardThe conversion of graphite into diamond is an endothermic reaction (AH = +3 kJ mol-1). C(graphite) → C(diamond) 1 The enthalpy change of atomisation of diamond is smaller than that of graphite. The bond energy of the C-C bonds in graphite is greater than that in diamond. 2 The enthalpy change of combustion of diamond is greater than that of graphite. 3 Which statements are correct? A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 onlyarrow_forwardOctane (C8H18) is combusted with oxygen to give carbon dioxide and water vapor. Calculate the enthalpy of reaction using the bond energies given. Is the combustion of octane an endothermic or exothermic reaction? The reaction below is not balanced. pleaseanswer neatly so i can see how to do it Bond: C=O O=O C–H O–H C–C Bond energy (kJ/mol): 799 498 414 464 347arrow_forward
- Based on the bond energies for the reaction below, what is the enthalpy of the reaction? HC≡CH (g) + 5/2 O₂ (g) → 2 CO₂ (g) + H₂O (g)arrow_forwardWhen gaseous sulfur trioxide is dissolved in concentratedsulfuric acid, disulfuric acid forms:SO₃(g)+ H₂SO₄(l) →H₂S₂O₇(l) Use bond energies Table to determine ΔH°ᵣₓₙ. (The S atoms in H₂S₂O₇ are bonded through an O atom. Assume Lewis structures with zero formal charges; BE of SNO is 552 kJ/mol.)arrow_forwardThe enthalpy change for the following reaction is -121 kJ. Using bond energies, estimate the C-H bond energy in CH4(9). CH4(9) + Cl₂(g) →→→CH3CI(g) + HCl(g) kJ/molarrow_forward
- Use bond energies to determine ΔHrxn for the reaction between ethanol and hydrogen chloride. CH3CH2OH(g)+HCl(g)→CH3CH2Cl(g)+H2O(g) Average Bond Energies Bond Bond Energy (kJ/mol) H−C 414 H−O 464 H−F 565 H−Cl 431 H−Br 364 C−Cl 339 C−O 360 Cl−F 253 Cl−Cl 243 Br−Cl 218arrow_forwardEstimate the enthalpy change for the reaction: 2CO + O2 ⟶2CO2 given the following bond energies. BE(C O) = 1074 kJ/mol BE(O=O) = 499 kJ/mol BE(C=O) = 802 kJ/mol Hint: You need to draw the Lewis Structures of the compounds to know the bonds present. Group of answer choices +2380 kJ/mol -561 kJ/mol +744 kJ/mol +1949 kJ/mol -744 kJ/molarrow_forwardHydrazine, N2H4, burns in oxygen as follows: N2H4 + O2 → N2 + 2H2O [The bond energies in kJ/mol are: N-H = 388; N-N 163; N≡N 944; O-H 463; O=O 496] Draw the chemical structures of the reactants and products and give the formula to calculate enthalpy change in a reaction, ΔH.arrow_forward
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