high school general chemistry thermochemistry practice problems
ange for the reaction: C₂H₄ (g) → C₂H₂ (g) + H₂ (g) Solution: Write the reaction as a combination of formation reactions: Using the enthalpies of formation, the change is: ΔH = [ΔH°f (C₂H₂) + ΔH°f (H₂)] − [ΔH°f