Silicon nitride, Si₃N₄, has physical, chemical, and mechanical properties that make it a useful industrial material. For a particular engineering project, it is crucial that you know the heat of formation of this substance. A clever experiment allows direct determination of the ΔH° of the following reaction:

Based on the fact that you know the enthalpy change in this reaction, state what additional data might be looked up or measured to determine ΔH_f^° for silicon nitride.

Transcribed Image Text:

3 CO₂(g) + Si3N4(s) → 3 SiO₂(s) + 2 N₂(g) + 3 C(s)