Calculate AH for the reaction C2 H4 (g) + H2 (g) → C2H6 (g). from the following data. C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2H2O (1) 1411 kJ / mol ΔΗ C2H6 (g) + O2 (g) → 2 CO2 (g) + 3 H2O (1) ΔΗ 1560 kJ / mol H2 (g) + O2 (g) → H2O (1) ΔΗ 285.8 kJ /mol

The combustion of 0.1558 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 0.2150-g sample of vanillin (C8H9O3) is then burned in the same calorimeter, and the temperature increases by 3.29°C. What is the energy of combustion per gram of vanillin? Energy =  kJ/g Per mole of vanillin? Energy =  kJ/mol

Calculate AH for the reaction NH3 (g) + CH4 (g) → HCN (g) + 3 H2 (g) , from the following data. N2 (g) + 3 H2 (g) → 2 NH3 (g) ΔΗ- – 91. 8 kJ /mol C (s, graphite) + 2 H2 (g) → CH4 (g) - 74. 9 kJ / mol AH = 2 C (s, graphite) + H2 (g) + N2 (g) → 2 HCN (g) AH = ΔΗ: 270. 3 kJ / mol

Use the bond energies provided to estimate ΔH°rxn for the reaction below.                           C2H4(g) + H2(g)  →  C2H6(g)    ΔH°rxn = ?   Bond         Bond Energy (kJ/mol) C-C           347 C-H           414 C=C          611                        C≡C          837 H-H           436   [NOTE: You may need to draw the Lewis structures in order to determine the types of bonds.] -166 kJ +98 kJ -128 kJ -102 kJ +700 kJ

CH4(g) + 4Cl2(g) → CCl4(g) + 4HCl(g), ΔH = –434 kJBased on the above reaction, what energy change occurs when 2.2 moles of methane (CH4) reacts?

Methanol can be synthesized from graphite according to the following reaction, calculate the enthalpy change, in kJ/mol, for the overall reaction: 2C(graphite) + 4H2(g) + O2(g) → 2CH3OH(l) Using the data given below: C(graphite) + O2(g) → CO2(g)     ΔrH = -393.5 kJ/mol 2H2(g) + O2(g) → 2H2O(l)     ΔrH = -571.6 kJ/mol 2CH3OH(l) + 3O2(g) → 2CO2(g) + 4H2O(l)     ΔrH = -1452.8 kJ/mol (Enter the numerical value in the space provided below, be sure to include the negative sign if needed.

Using the standard enthalpies of formation (pictured), calculate ΔHº for the following reactions:a) CO2 (g) + 2NH3 (g) → H2O (g) + CO(NH2)2 (g) b) 2CH4 (g) + Cl2 (g) → 2 CH3Cl (g)

The combustion of methanol is described by the following equation. 2 CH3OH (l) + 3O2 (g) → 2 CO2 (g) + 4 H2O (l), ΔH = −1454 kJ What is the enthalpy change for the combustion of 15.61 g methanol (CH3OH) in excess oxygen?

Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C,Ha (-1300. kJ/mol), CH (-1560. kJ/mol), and Ha (-286 kJ/mol), calculate AH for the reaction CH (s)+ 2H (s)C,He (g) 1- AH- kJ

2. Using Hess's Law, Calculate enthalpy change for: NO (g) + O₂ (g) → NO₂ (g) Given the following enthalpies of reaction ½ N₂ (g) + O₂(g) → NO₂(g) AH = + 33.8 kJ 12 N₂ (g) + 1/2O2 → NO (g) AH = -566.0 kJ