🤓 Based on our data, we think this question is relevant for Professor Graham's class at ARIZONA.
We’re being asked to determine the standard enthalpy change of formation (ΔH˚rxn) for NO.
Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:
The chemical equation for that reaction is:
N2(g) + O2(g)→ NO(g)
This equation is not yet balanced. To balance it, we have to make sure that the number of elements on both sides is equal.
Balance N: We have 1 N2 on the reactant side and 1 O on the product side – add a coefficient of 2 to NO:
N2(g) + O2(g)→ 2 NO
A gas-phase reaction was run in an apparatus designed to maintain a constant pressure.
Using data from Appendix C in the textbook, determine H for the formation of one mole of the product.