Bond Enthalpy — Prelims Questions

Given the following average bond enthalpies: C-H = $413\,\text{kJ/mol}$ O=O = $498\,\text{kJ/mol}$ C=O = $799\,\text{kJ/mol}$ O-H = $463\,\text{kJ/mol}$ Calculate the enthalpy change ($\Delta H$) for the combustion of methane: CH$_4$(g) + 2O$_2$(g) \(\rightarrow\) CO$_2$(g) + 2H$_2$O(g)

Which of the following statements about bond enthalpy is INCORRECT?

Given the following reaction: N$_2$(g) + 3H$_2$(g) \(\rightarrow\) 2NH$_3$(g) And the average bond enthalpies: N\(\equiv\)N = $945\,\text{kJ/mol}$ H-H = $436\,\text{kJ/mol}$ N-H = $391\,\text{kJ/mol}$ Calculate the enthalpy change ($\Delta H$) for the reaction.

Which of the following bonds would you expect to have the highest bond enthalpy?

The bond enthalpy of H-Cl is $431\,\text{kJ/mol}$. What is the energy change when 2 moles of H-Cl bonds are formed from gaseous H and Cl atoms?

Consider the following bond enthalpies (in kJ/mol): C-C = 348 C=C = 614 C\(\equiv\)C = 839 Which of these bonds is the most stable?

The enthalpy of atomization of methane (CH$_4$) is $1660\,\text{kJ/mol}$. What is the average bond enthalpy of a C-H bond?