Estimate ΔH°, in kJ, for the following reaction from the bond energies given below.  N2(g) + 3H2(g) → 2NH3(g) Bond energy (kJ/mol): N-N 163, N=N 418 N triple bond N 946, H-H 436, N-H 389

Use average bond enthalpy (D) values available under the Thermochemistry heading on ACORN to calculate ΔrH for the following reaction: 2NH3 + 3Cl2 → N2 + 6HCl Express your answer to 3 significant figures.

PCB, CO, HCO3, H&PO4 2.Calculate the enthalpy change for the reaction H2+ CH20 CH3OH given the following bond enthalpies: C-H=413 kJ/m, C-C = 348 kJ/m, C-0 = 358 kJ/m, C-0=743 kJ/m, H-H=436 kJ/m, O-H=463 kJ/m %3D %3D 11 %3D %3D

Use the bond dissociation energies provided to calculate the detla H (in kilojoules) for the combustion of ethylene gas according to the balanced equation provided: C2H4 (g) + 3 O2 (g) equals 2 CO2 (g) + 2 H2O (g)

True or False: This reaction is endothermic because more energy is needed to break up the reactants versus the amount given off by the products. Use the reaction and bond information to answer the question. H-H +0=C = 0 - H-C = O | O-H H2 + CO, → CH,O. Reactant bond energies: H-H is 432 kJ/mol, C=O is 799 kJ/mol Product bond energies: C-H is 413 kJ/mol, C=O is 745 kJ/mol, C-O is 358 kJ/mol, O-H is 467 kJ/mol ○ True ○ False 1

Use average bond enthalpies (linked above) to calculate the enthalpy change for the following gas-phase reaction. C2H4(g) + Br2(g) CH,BRCH,Br(g) To analyze the reaction, first draw Lewis structures for all reactant and product molecules. • Include all valence lone pairs in your answer. • Draw the reaction using separate sketchers for each species. One molecule per sketcher, please. Separate multiple reactants and/or products using the + sign from the drop-down arrow. Separate reactants from products using the If you have to draw H,, draw H-H. • Be sure that your structural equation is balanced. symbol from the drop-down menu.

Calculate the heat of the following reaction from the given bond energies. Give the answer to 3 significant figures. 2CH3CH3+7O2⟶4CO2+6H2O2CH3CH3+7O2⟶4CO2+6H2O Bond Energies C-H: 349            C-C: 270 O=O: 592          C=O: 695 O-H: 313

Using bond enthalpies in the table, estimate AH for the following gas-phase reactions. Average Bond Enthalpies (kJ/mol) Single Bonds C-H C-C C-N C-O C-F C-Cl C-Br C-I C-S 413 |N-H 348 |N-N 293 N-O 358 |N-F 485 |N-Cl 328 N-Br 243 276 240 259 CH–C1 242 193 Br-Br Multiple Bonds C=C C=C C=N C=N 614 839 615 391 O-H 0-0 163 201 O-F 272 O-Cl 200 O-I 201 463 146 190 203 234 339 H-H S-H 436 S-F 567 S-Cl 327 253 H-F H-Cl 431 S-Br 218 H-Br 366 S-S 266 H-I 299 |N=N 418 0=0 |N=N 941 |N=O 607 495 Part C Estimate AH for the reaction. Express your answer using one significant figure. AH = Submit —| ΑΣΦ Provide Feedback H H-N-N-H+CI-CI-2 H-N-CI -H+C₁_a_ Previous Answers Request Answer HH X Incorrect; Try Again; 3 attempts remaining ? kJ

Using the table of bond enthalpies in your textbook, predict ArH for the following reaction. Express your answer in kJ/mol. HCECH + 2 H2 → H3C-CH3

Use the data below to calculate the bond energy for a C-F bond in kJ/mol. Bond Energy (kJ/mol) С-Н 413 H-F 567 С-С 347 H-CI .431 F-F 159 H-Br 364 Cl-CI 243 H-I 297. Br-Br 193 I-I 151 The reaction shown below has AH = -3372 kJ as written C2H6lg) + 7 F2(g) → 2 CF4(g) + 6 HFig) In C2H6 each C makes 3 bonds with H and 1 bond with C 485 kJ/mol O 489 kJ/mol O -503 kJ/mol O none of the answers are correct