Visualizing ConceptsThe gas-phase reaction shown, between N2 and O2, was run in an apparat...

Visualizing Concepts

The gas-phase reaction shown, between N2 and O2, was run in an apparatus designed to maintain a constant pressure. (a) Write a balanced chemical equation for the reaction depicted and predict whether w is positive, negative, or zero. (b) Using data from Appendix C, determine ΔH for the formation of one mole of the product. Why is this enthalpy change called the enthalpy of formation of the involved product? [Sections]