Use average bond energies to estimate the energy released when 40.0 g CH4 undergoes complete combustion: CH,(g) + 20,(g) → co,(g) + 2H,0(g)

Given the enthalpies of reaction.    P4 (s)  +  3 O2 (g)  → P4O6 (s)                        ΔH = -1640.1 kJ         P4 (s)  +  5 O2 (g) → P4O10 (s)                        ΔH = -2940.1 kJ   calculate the enthalpy change for the reaction   P4O6 (s)  +  2 O2 (g)  →  P4O10 (s)                 ΔH =  ________________kJ

Given the standard enthalpy changes for the following two reactions: (1) 2Ni(s) + O2(g) →2N¡O(s) AH° = -479.4 kJ (2) 2Hg(1) + O2(g)→2HgO(s) AH° =-181.6 kJ what is the standard enthalpy change for the reaction: (3) NiO(s) + Hg(1)→Ni(s) + HgO(s) AH° =? kJ

The combustion of 0.1584 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.) A 0.2130-g sample of vanillin (C8H8O3) is then burned in the same calorimeter, and the temperature increases by 3.25°C. What is the energy of combustion per gram of vanillin? Per mole of vanillin?

The combustion of 0.1566 g benzoic acid increases the temperature of a bomb calorimeter by 2.51°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 0.2195-g sample of vanillin (Cg H3 O3) is then burned in the same calorimeter, and the temperature increases by 3.21°C. What is the energy of combustion per gram of vanillin? Energy = kJ/g Per mole of vanillin? Energy = kJ/mol

Calculate the enthalpy change for the reaction C2H2(g) + 2H2(g) → C2H6(g)     ΔrH = ? from the following information: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)    ΔrH = –2320 kJ/mol2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(g)    ΔrH = –3040 kJ/mol2H2(g) + O2(g) → 2H2O(g)                         ΔrH = –572 kJ/mol

Using the standard enthalpies of formation in the picture, calculate ΔHº for the following reactions:a) 2H2O2 (l) → 2H2O (l) + O2 (g) b) CH4 (g) + Cl2 (g) → CH3Cl (g) + HCl (g) c) HCl (g) + NaOH (s) → NaCl (s) + H2O (l)

Given the following reactions: 2S(s) + 3O2(g) → 2SO3(g)                 ΔH = -790 kJ S(s) + O2(g) → SO2(g)                              ΔH = -297 kJ Determine the enthalpy of the reaction in which sulfur dioxide is oxidized to sulfur trioxide, 2SO2(g) + O2(g) → 2SO3(g).