Chemistry (7th Edition)
7th Edition
ISBN: 9780321943170
Author: John E. McMurry, Robert C. Fay, Jill Kirsten Robinson
Publisher: PEARSON
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Chapter 7, Problem 7.57CP
Explain the difference in the
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Use bond energies to calculate the energy change for this reaction.
ΔΕ =
=
CH3
H3C-C-H
CH3
+ Br-Br
CH3
-C-Br +
CH3
H3C-C-
kJ/mol
H-Br
Bond
H-H
Br-Br
H-Br
C-H
C-Br
Energy (kJ/mol)
436
194
366
410
270
37) Use bond energies to calculate the enthalpy changes for the formation of ethane
(C;H6) from ethylene (C3Ha) and hydrogen (H2). Bond energies: H'(kJ/mol):
(C-H): 413, (C-C): 614, (C-C): 348, (H-H): 446. Is the reaction endo or
exothermic ?
H H
H-c-C-H
C=c
H-H
H H
a) - 114
b) + 114
c) - 230
d) +330
Use the bond energy to estimate the heat of reaction at 25 °C for the reaction below.
CH4 (g) + 2 02 (g) → CO2 (g) + 2 H2O(g)
Compare your result with that calculated from enthalpies of formation.
Chapter 7 Solutions
Chemistry (7th Edition)
Ch. 7 - Prob. 7.1PCh. 7 - Conceptual APPLY 7.2 An electrostatic potential...Ch. 7 - Prob. 7.3PCh. 7 - Prob. 7.4ACh. 7 - Prob. 7.5PCh. 7 - Prob. 7.6ACh. 7 - Prob. 7.7PCh. 7 - Prob. 7.8ACh. 7 - Prob. 7.9PCh. 7 - Prob. 7.10A
Ch. 7 - Prob. 7.11PCh. 7 - Prob. 7.12ACh. 7 - Prob. 7.13PCh. 7 - Prob. 7.14ACh. 7 - Prob. 7.15PCh. 7 - Prob. 7.16ACh. 7 - Prob. 7.17PCh. 7 - Prob. 7.18ACh. 7 - Prob. 7.19PCh. 7 - Prob. 7.20ACh. 7 - Prob. 7.21PCh. 7 - Prob. 7.22ACh. 7 - Prob. 7.23PCh. 7 - Prob. 7.24PCh. 7 - Prob. 7.25PCh. 7 - Prob. 7.26PCh. 7 - Prob. 7.27PCh. 7 - Prob. 7.28PCh. 7 - Prob. 7.29CPCh. 7 - Prob. 7.30CPCh. 7 - Prob. 7.31CPCh. 7 - Prob. 7.32CPCh. 7 - Prob. 7.33CPCh. 7 - Prob. 7.34CPCh. 7 - Prob. 7.35CPCh. 7 - Prob. 7.36CPCh. 7 - Prob. 7.37CPCh. 7 - Prob. 7.38CPCh. 7 - Prob. 7.39CPCh. 7 - Prob. 7.40CPCh. 7 - Prob. 7.41CPCh. 7 - Prob. 7.42CPCh. 7 - Prob. 7.43CPCh. 7 - Prob. 7.44CPCh. 7 - Prob. 7.45CPCh. 7 - Prob. 7.46CPCh. 7 - Prob. 7.47CPCh. 7 - Prob. 7.48CPCh. 7 - Which of the substances...Ch. 7 - Prob. 7.50CPCh. 7 - Order the following compounds according to the...Ch. 7 - Prob. 7.52CPCh. 7 - Prob. 7.53CPCh. 7 - Prob. 7.54CPCh. 7 - Prob. 7.55CPCh. 7 - Explain the difference in the bond dissociation...Ch. 7 - Explain the difference in the bond dissociation...Ch. 7 - Prob. 7.58CPCh. 7 - Prob. 7.59CPCh. 7 - Prob. 7.60CPCh. 7 - Prob. 7.61CPCh. 7 - Prob. 7.62CPCh. 7 - Prob. 7.63CPCh. 7 - Prob. 7.64CPCh. 7 - Prob. 7.65CPCh. 7 - Prob. 7.66CPCh. 7 - Prob. 7.67CPCh. 7 - Prob. 7.68CPCh. 7 - Prob. 7.69CPCh. 7 - Prob. 7.70CPCh. 7 - Prob. 7.71CPCh. 7 - Identify the third-row elements, X, that form the...Ch. 7 - Identify the fourth-row elements, X, that form the...Ch. 7 - Prob. 7.74CPCh. 7 - Prob. 7.75CPCh. 7 - Methyiphenidat (C14H19NO2) , marketed as Ritalin,...Ch. 7 - Prob. 7.77CPCh. 7 - Prob. 7.78CPCh. 7 - Prob. 7.79CPCh. 7 - Prob. 7.80CPCh. 7 - Prob. 7.81CPCh. 7 - Prob. 7.82CPCh. 7 - Prob. 7.83CPCh. 7 - Prob. 7.84CPCh. 7 - Prob. 7.85CPCh. 7 - Prob. 7.86CPCh. 7 - Prob. 7.87CPCh. 7 - Prob. 7.88CPCh. 7 - Prob. 7.89CPCh. 7 - Prob. 7.90CPCh. 7 - Draw two electron-dot resonance structures that...Ch. 7 - Prob. 7.92CPCh. 7 - Prob. 7.93CPCh. 7 - Prob. 7.94CPCh. 7 - Prob. 7.95CPCh. 7 - Prob. 7.96CPCh. 7 - Prob. 7.97CPCh. 7 - Prob. 7.98CPCh. 7 - Prob. 7.99CPCh. 7 - Write an electron-dot structure for chloral...Ch. 7 - Prob. 7.101CPCh. 7 - Prob. 7.102CPCh. 7 - Prob. 7.103CPCh. 7 - Prob. 7.104CPCh. 7 - Prob. 7.105CPCh. 7 - 7.106 Themolecule has nitrogen-oxygen bonds, but...Ch. 7 - Prob. 7.107CPCh. 7 - Prob. 7.108MPCh. 7 - Prob. 7.109MPCh. 7 - Prob. 7.110MPCh. 7 - Prob. 7.111MPCh. 7 - Prob. 7.112MP
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- Determine AHxn for the reaction 2 CO2(g) + 4 H20(g) → 2 CH3OH(g) + 3 O2(g) given the following average bond energies (values given parentheses) C-H (414 kJ/mol) C-O (360 kJ/mol) O-H (464 kJ/mol) O=O (498 kJ/mol) C=O (799 kJ/mol) Provide your answer in decimal notation rounded to 4 significant figures.arrow_forwardHow do I go about calcualting the estimated heat of reaction of the equation shown in the image. Could you explain in detail please. bond energies:H-H 436 kJ/molH-X 431 kJ/molH-C 414 kJ/molC-X 339 kJ/molX-X 243 kJ/moarrow_forwardUse the observed bond lengths to answer each question. (a) Why is bond [1] longer than bond [2] (143 pm versus 136 pm)? (b) Why are bonds [3] and [4] equal in length (127 pm), and shorter than bond [2]?arrow_forward
- Calculate the enthalpy change for the reaction shown below between ammonia and phosgene to produce urea and HCI. Use the bond-dissociation energies listed in the table. Bond H-CI H-N C-CI C-N CI + 2 NH3 AHBDE (kJ/mol) 432 339 397 748 AHrxn = +444 kJ/mol AHrxn= -888 kJ/mol AHrxn= -444 kJ/mol AHrxn= +888 kJ/mol .C. HẠN-“NH, * 2 H-CIarrow_forward2-Butanol can be made by the reaction of 1-butene and water: H2 C=CH-CH,–CH3 (g) + H2O(g) → CH; CH(OH)CH2CH3 (g) a Use bond dissociation enthalpies to estimate the enthalpy change in this reaction. Bond AH (kJ/mol) H-O 463 C=C 610 H-C 413 C-C 346 358 Enthalpy change = kJ b Calculate the enthalpy change for this reaction from enthalpies of formation. Substance AƒH (kJ/mol) CH3 CH(OH)CH2 CH3 (g) -293.1 H2O(g) -241.83 H2C=CH-CH2–CH3 (g) -0.1300 Enthalpy change = kJarrow_forwardHow much energy (in kJ) is required to separate (break) one mole of H-H bonds? Bond Length (pm) Energy (kJ/mol) H-H 74 436 H-C 106.8 413 H-N 101.5 391 H-O 97.5 467 O A) +436 kJ B) -436 kJ O C) +74 kJ D) -74 kJ E) 106.8 kJarrow_forward
- Using the values of bond energy from the table below, estimate the enthalpy change for the following reaction: C2H4 (9) + H₂O2 (g) → CH₂OHCH₂OH(9) ΔΗ, rxn Bond Bond Energy (kJ/mol) C=C 602 0-0 146 C-C 346 C-O 358 = kJarrow_forwardIf the following reaction is given: C2H5F + Cl2 || AHran If the bond energy for C-H is 414 kJ/ mole, the bond energy for C-C is 347 kJ/mole, the bond energy for C-Cl is 377 kJ/ mole, the bond energy for Cl-Cl is 243 kJ/ mole, the bond energy for C-F is 450 kJ/ mole and the done energy for H-Cl is 431 kJ/ mole, determine the bond energy for the H-F bond in kJ/mole. C2H4Cl2 + HF 151kJ mole Give your answer as a positive value as all energies for bond values should be written in terms of a positive value (the energy needed to break the bond = endothermic)arrow_forwardFor the following chemical reaction determine the heat of reaction (Bond enthalpy). Is this reaction exothermic or endothermic? H2C == CH2 + HCl ⟶⟶ CH3CH2Cl Bond Energy: C–H : 100 kcal/mol ; C=C: 145kcal/mol ; C-C: 83 kcal/mol ; H-Cl: 102 kcal/mol ; C-Cl : 81 kcal/mol bonds in reactant : 4 C-H , C=C, H-Cl bonds in Products: C-C, 5 C-H, C-Clarrow_forward
- Octane (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_forwardUse bond energies listed in Table available on Canvas to find AHx for the reactions shown below: 1) Η H H H 1 H-0-0-H H-O-C-C- H CH₂O H + H CHÍNH H₂O NH₁ HICIH -O-Harrow_forwardiii) What is Bond Energy Term? iv) Given the following bond energy terms; C=C: +835KJmol-1, C-C : +346KJmol-1, C-H: +413KJmol-1, H-H: +436KJmol-1. Determine the enthalpy change for the reaction: 2H2 (g) + C2H2 (g) → CH3CH3 (g)arrow_forward
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