Homework Answers
Q3 1) Bond energy is the energy required to break a bond in gaseous state and drie the two constituent atoms apart. Since energy is always supplied in bond breaking, bond energy is always a positive value.
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Question Three (6 marks) The average bond energies (in kJ mol) are given in the table...
16) (10 pts.) Using the table of average bond energies below, what is AH for the...
16) (10 pts.) Using the table of average bond energies below, what is AH for the reaction? HaC-O-H (g) → CEO(g) + 2H2(g) 413 Bond: Enthalpy (kJ/mol):358 1072 436 463 799
Bond Dissociation Energies (for A-B Bond broken AH, kJ/mol Bond broken → A A4, kJ/mol +...
Bond Dissociation Energies (for A-B Bond broken AH, kJ/mol Bond broken → A A4, kJ/mol + B) Bond broken mo H-H CH3CH2CH2-H (CH3)2CH-H (CH3)3C-H 436 423 413 400. H-Br 366 CH3CH2CH2-Br 294 (CH3)2CH-Br 298 (CH3)3C-Br292 Br-Br 193 H-CI 432 CH3CH2CH2-CI 354 (CH3)2CH-CI 355 (CH3)3C-CI 349 CI-CI 243 Alkane halogenation is a two-step reaction, as shown below. Using the table of bond dissociation energies, calculate the enthalpy of each step and the enthalpy of the overall reaction. Step 1: Number CH3CHCH3...
Using the table of average bond energies below, the AH for the reaction is k], C=0(g)...
Using the table of average bond energies below, the AH for the reaction is k], C=0(g) + 2H2(g) → H3C-0-Hg) Bond: C-0 C=0 C=0 D(kJ/mol): 358 799 1072 C-H 413 H-H 436 O-H 463 -116 -276 +116 +276
Using the bond energies from the table below estimate ∆H for the following reaction C2H2(g) +...
Using the bond energies from the table below estimate ∆H for the following reaction C2H2(g) + H2(g) → C2H4(g) C-H (413), H-H (436), C-C (348), C=C (614), C≡C (839) A) +165 kJ/mol B) -390. kJ/mol C) +390. kJ/mol D) –124 kJ/mol E) –165 kJ/mol
Part A. Find the average enthalpy of the PF bond in PF5(g) from the following standard...
Part A. Find the average enthalpy of the PF bond in PF5(g) from
the following standard molar enthalpies of formation (in kJ/mol):
PF5(g) (–1595), P(g) (315), F(g) (79).
Part B.
Using the bond energies from the table below estimate AH for the following reaction C2H2(g) + H2(g) → C2H4(g) Bond Bond energy [kJ/mol] [C-H 413 H-H 436 |C-C 348 C=C 614 csc 839
Part A. Given the bond dissociation energies (in kJ/mol) for the following diatomic molecules Cl2 (243),...
Part A. Given the bond dissociation energies (in kJ/mol) for the following diatomic molecules Cl2 (243), F2 (158), H2 (436), O2 (498), N2 (945) choose the one(s) that could be broken by using blue light (λ=465 nm). Part B. Given the bond energies (in kJ/mol) of the following bonds: F–F (155), F–Cl (193), and Cl–Cl (243), estimate the molar enthalpy of formation of ClF(g), that is find ∆H for the following reaction ½Cl2(g) + ½F2(g) → ClF(g)
Using the table of average bond energies below, the AH for the reaction is kJ. нн...
Using the table of average bond energies below, the AH for the reaction is kJ. нн H-CEC-H(g) 2HI (g) I-CC-I(g) нн Bond: CECC-C H-1 C-IC-H D (kJ/mol): 839 348 299 240 413 -63 -160 +160 +63 -217 B. Are the following statements true or false? Consider the hypothetical molecule B A Drag the appropriate statements to their respective bins. Help Reset If resonance was important, the molecule would have identical A bond lengths. This molecule cannot exist true false
1. Bond Dissociation Energies and Free Radicals Bond Bond Dissociation Energies (kJ/mol) Bond BDE Bond BDE...
1. Bond Dissociation Energies and Free Radicals Bond Bond Dissociation Energies (kJ/mol) Bond BDE Bond BDE (kJ/mol) (kJ/mol) H-H 436 CH3-H 439 H-F 570 CH3CH2-H 432 H-CI 432 (CH3CH2 413 BDE Bond (kJ/mol) 10-N 350 0-0 180 F-F O-H 0-C O-F 460 BDE (kJ/mol) | 200 180 159 | H-Br H-I 366 298 404 350 O-C1200 O-Br (CH3)3C-H C-C (sigma) C=C(pi) 210 C1-C1243 Br-Br 193 243 0 -I 220 I-I | 151 A. The enzyme methane monooxygenase catalyzes a remarkably...
7) Use the bond energies (kJ/mol) to calculate the heat of reaction: C-O 799 N-H: 391...
7) Use the bond energies (kJ/mol) to calculate the heat of reaction: C-O 799 N-H: 391 C-N 3050-H: 467 O=C=0 + 2NH 8) Acetic acid is produced in the reaction between methanol and carbon monoxide: H-C-0-H + C=O- Use bond energies (kJ/mol) to calculate the enthalpy of reaction. C-O: 358 C-H: 413 0-H: 467CEO: 1070 C-C: 347 C=0: 745C-O: 358
Name: Quiz 9 CHE 1030 1. Using the following bond energies Bond Energy (kJ/mol) 839 413...
Name: Quiz 9 CHE 1030 1. Using the following bond energies Bond Energy (kJ/mol) 839 413 495 799 467 Bond C-H O-0 C-O O-H estimate the heat of combustion for 1 mol of acetylene: C2H2(g)+ O2(g) → 2CO2(g)+H2O(g) 2. Using the following data reactions: H2(g) + Cl2(g) → 2HCl(g) H2(g) → 2H(g) Cl2(g) 2CIg) AP (kJ) -184 432 239 calculate the energy of an H-Cl bond.
16) (10 pts.) Using the table of average bond energies below, what is AH for the reaction? HaC-O-H (g) → CEO(g) + 2H2(g) 413 Bond: Enthalpy (kJ/mol):358 1072 436 463 799
Bond Dissociation Energies (for A-B Bond broken AH, kJ/mol Bond broken → A A4, kJ/mol + B) Bond broken mo H-H CH3CH2CH2-H (CH3)2CH-H (CH3)3C-H 436 423 413 400. H-Br 366 CH3CH2CH2-Br 294 (CH3)2CH-Br 298 (CH3)3C-Br292 Br-Br 193 H-CI 432 CH3CH2CH2-CI 354 (CH3)2CH-CI 355 (CH3)3C-CI 349 CI-CI 243 Alkane halogenation is a two-step reaction, as shown below. Using the table of bond dissociation energies, calculate the enthalpy of each step and the enthalpy of the overall reaction. Step 1: Number CH3CHCH3...
Using the table of average bond energies below, the AH for the reaction is k], C=0(g) + 2H2(g) → H3C-0-Hg) Bond: C-0 C=0 C=0 D(kJ/mol): 358 799 1072 C-H 413 H-H 436 O-H 463 -116 -276 +116 +276
Part A. Find the average enthalpy of the PF bond in PF5(g) from
the following standard molar enthalpies of formation (in kJ/mol):
PF5(g) (–1595), P(g) (315), F(g) (79).
Part B.
Using the bond energies from the table below estimate AH for the following reaction C2H2(g) + H2(g) → C2H4(g) Bond Bond energy [kJ/mol] [C-H 413 H-H 436 |C-C 348 C=C 614 csc 839
Using the table of average bond energies below, the AH for the reaction is kJ. нн H-CEC-H(g) 2HI (g) I-CC-I(g) нн Bond: CECC-C H-1 C-IC-H D (kJ/mol): 839 348 299 240 413 -63 -160 +160 +63 -217 B. Are the following statements true or false? Consider the hypothetical molecule B A Drag the appropriate statements to their respective bins. Help Reset If resonance was important, the molecule would have identical A bond lengths. This molecule cannot exist true false
1. Bond Dissociation Energies and Free Radicals Bond Bond Dissociation Energies (kJ/mol) Bond BDE Bond BDE (kJ/mol) (kJ/mol) H-H 436 CH3-H 439 H-F 570 CH3CH2-H 432 H-CI 432 (CH3CH2 413 BDE Bond (kJ/mol) 10-N 350 0-0 180 F-F O-H 0-C O-F 460 BDE (kJ/mol) | 200 180 159 | H-Br H-I 366 298 404 350 O-C1200 O-Br (CH3)3C-H C-C (sigma) C=C(pi) 210 C1-C1243 Br-Br 193 243 0 -I 220 I-I | 151 A. The enzyme methane monooxygenase catalyzes a remarkably...
7) Use the bond energies (kJ/mol) to calculate the heat of reaction: C-O 799 N-H: 391 C-N 3050-H: 467 O=C=0 + 2NH 8) Acetic acid is produced in the reaction between methanol and carbon monoxide: H-C-0-H + C=O- Use bond energies (kJ/mol) to calculate the enthalpy of reaction. C-O: 358 C-H: 413 0-H: 467CEO: 1070 C-C: 347 C=0: 745C-O: 358
Name: Quiz 9 CHE 1030 1. Using the following bond energies Bond Energy (kJ/mol) 839 413 495 799 467 Bond C-H O-0 C-O O-H estimate the heat of combustion for 1 mol of acetylene: C2H2(g)+ O2(g) → 2CO2(g)+H2O(g) 2. Using the following data reactions: H2(g) + Cl2(g) → 2HCl(g) H2(g) → 2H(g) Cl2(g) 2CIg) AP (kJ) -184 432 239 calculate the energy of an H-Cl bond.
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