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- What in Bacha'2H2O? 3 the true percen tage of weterHow 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?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 Enthalpy (AH, in kJ/mol) for the following reaction from the heat of rxn formation data given below (Hint: Carefully check the state symbols in this reaction): 4 NO (g) + 6 H20 (I) → 4 NH3 (g) + 5 O2 (g) = ? NH3(g) AH, = - 45.9 kJ/mol NO(g) = + 90.3 kJ/mol H20(1) AH 285.8 kJ/mol = - H20(g) AH = - 241.80 kJ/mol fTwo lasers generate radiation of (1) 9.5 µm and (2) 0.1 µm respectively.(a) For each of the radiations, determine the photon energy (in eV).(b) Will either of the two radiations be able to break (dissociate) the Si–H bondin SiH4? Given: ESi-Si = 180 kJ/moleEH-H = 435 kJ/moleCalculate AH for the following reaction, FeO(s) + CO(g) -----> Fe(s) + CO2(g), from the following data, Fe2O3(s) + 3CO(g) -----> 2Fe(s) + 3CO2(g) 3Fe2O3(s) + CO(g) > 2FE3O4(s) + CO2(g) Fe;O4(s) + CO(g) AH = -23 KJ AH = -39 KJ --- -- -----> 3FeO(s) + CO2(g) AH =+18 KJ %3D
- بلند ہلا A B D compound C Give the name of compound A compound B and compound D NH2.For anion NO2-, (a) predict the stereochemistry. Justify your prediction with VSEPR theory and by formal charge; (b) indicate the hybridization appropriate to the stereochemistry; (c) describe the bond character of N-O for the resonance structure.ow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator=assignment-take [References] The combustion of 0.1562 g benzoic acid increases the temperature of a bomb calorimeter by 2.54°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.) Heat capacity kJ/°C A 0.2186-g sample of vanillin (C8 Hg O3) is then burned in the same calorimeter, and the temperature increases by 3.26°C. What is the energy of combustion per gram of vanillin? Energy kJ/g Per mole of vanillin? Energy kJ/mol
- Which of the following statements is true? (A) Because HCl is a strong acid, the bond dissociation energy of HCl is smaller than that of Cl₂. (B) The Cl₂ bond cannot cleavage by increasing temperature. (C) Yellow light cannot cleavage Cl2 bond, you can do it well by increasing amplitude of yellow light. (D) The electromagnetic wavelength required to cleavage Cl2 bond is greater than that to cleavage Br2 bond (E) The oxygen atoms are found easily far away from earth surface than it be found in earth surface.An important reaction in the formation of photochemicalsmog is the photodissociation of NO2:NO2 + hv---->NO(g) + O(g) The maximum wavelength of light that can cause this reactionis 420 nm. (a) In what part of the electromagnetic spectrumis light with this wavelength found? (b) What is themaximum strength of a bond, in kJ/mol, that can be brokenby absorption of a photon of 420-nm light? (c) Write out thephotodissociation reaction showing Lewis-dot structures.Using a table of average bond enthalpies. Table 6.2 ( Sec. 6-6b), estimate the enthalpy change for the industrial synthesis of methanol by the catalyzed reaction of carbon monoxide with hydrogen.