IB FRQ #16 Thermochemistry

This problem goes through average bond enthalpies or energies for the nitrogen triiodide reaction. It additionally considers entropy beyond enthalpy. The fact that the entropy change is positive and enthalpy change is negative implies a spontaneous reaction with a negative Gibb's free energy value. Lastly we consider how the reaction enthalpy would change if we consider the state of matter of the iodine to be in the solid state instead of gaseous state. This can be done using Hess's Law or with use of a reaction energy diagram. A small error in the end of the video is that the enthalpy of sublimation should be tripled for the reaction as written as there are 3 iodine molecules to sublimate in the reaction and thus we should adjust to 3 moles of enthalpy of sublimation.