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- How do I (a) determine the energy change in the following reaction2 O2 + CH4→ CO2 + 2 H2Ogiven the following bond dissociation energies:C-C 340kJ/mol; C-H 420kJ/mol; O=O 490 kJ/mol; O-H 460 kJ/mol; C=O 720 kJ/mol. (b) Is the reaction exothermic or endothermic? Explaination?Estimate ΔrH° for forming 2 mol ammonia from molecular nitrogen and molecular hydrogen. Is this reaction exothermic or endothermic?25. Write reasonable mechanisms for each of the following transformations.
- 18. (a) Molecule N₂H4 (1) + 2 H₂O2 (1) → N2(g) + 4 H₂O (1) Complete the following table: Lewis Dot Structure (use dots or lines to show bonds) (b) (c) (d) N₂H4 H₂O2 N₂ H₂O Calculate the AH°rxn using average bond energies (Table 9.4 in textbook) Calculate the AH°rxn using the standard enthalpies of formation (Appendix 2 in textbook) Why are these two values slightly different?Calculate the K, for the conjugate acid of C&HsO; given that the pH of a 0.372 M solution of K3C¿H;O, is 9.484.The breaking of the O-O bond in peroxydisulfuryl difluoride (FO,SOOSO,F) gives FO,SO: (FO2SO)2 2 2 FO2SO The compound on the left of this equation is a colorless liquid that boils at 67.1°C. Its vapor, when heated to about 100°C, turns brown as the product of the reaction forms. Suppose that, in a sample of the vapor, the intensity of the brown color doubles between 100°C and 110°C and that the total pressure increases only by the 2.7% predicted for an ideal gas. Estimate AH° for the preceding reaction.
- اور Li THF [ CHgBr 8The following equation describes the equilibrium that exists when the weak acid propionic acid (C2H5 CO,H) dissolves in water. (In acting as an acid, the -CO2H group supplies H+ to form H30*.) C2H; CO,H(aq) +H2O(l) 2 H,0+ (aq) + C2 H; CO2-(aq) a Which of the four species are Bronsted-Lowry acids? (Select all that apply.) O H20 O C2H; CO2- O H3o+ O C2H; CO,H b Which of the four species are Brønsted-Lowry bases? (Select all that apply.) O H2O O C2H;CO2 O H30+ O C;H; CO,HI want to synthesize the following compound Ai perform retrosynthetic analysis and propose a to construct a combon skeleton using the fours compounds shown on the right as as starting Synthetic route starting materials.