Calculate the energy change associated with the chemical reaction provided here. State whether it is endothermic or exothermic. [Bond energies (kJ/mol) : H-H: 436; N-H: 391; NΞN 945]
N₂ + 3 H₂ $\rightarrow$ 2 NH₃

Question

Calculate the energy change associated with the chemical reaction provided here. State whether it is endothermic or exothermic. [Bond energies (kJ/mol) : H-H: 436; N-H: 391; NΞN 945]
N₂ + 3 H₂

\rightarrow

2 NH₃

Quizplus · Accepted Answer

The reaction involves breaking 1 N≡N bond and 3 H-H bonds, and forming 6 N-H bonds. The energy change is calculated as: (945 + 3*436) - (6*391) = 1809 - 2346 = -537 kJ/mol. Since the energy change is negative, the reaction is exothermic. However, the closest choice to this calculation is -93.0 kJ/mol, exothermic.

Calculate the Energy Change Associated with the Chemical Reaction Provided →\rightarrow→

Calculate the Energy Change Associated with the Chemical Reaction Provided $\rightarrow$