For which of these reactions will the difference between $\Delta$H^$\circ$ and $\Delta$E^$\circ$be the greatest A) 2H₂O₂(l) $\rarr$ 2H₂O(l) + O₂(g) B) CaCO₃(s) $\rarr$ CaO(s) +CO₂(g) C) NO(g) + O₃(g) $\rarr$ NO₂(g) + O₂(g) D) 2C₂H₆(g) + 7O₂(g) $\rarr$ 4CO₂(g) + 6H₂O(l) E) 4NH₃(g) + 5O₂(g) $\rarr$ 4NO(g) + 6H₂O(g)

Question

Quizplus · Accepted Answer

The difference in standard enthalpy of formation (∆H°f) between products and reactants is a measure of the energy released or absorbed during the reaction. Therefore, the reaction with the largest difference in ∆H°f will have the most energy released or absorbed. Looking at the given reactions, option D has the largest number of reactants and products involved, indicating that more energy is released or absorbed. Therefore, the difference in standard enthalpy of formation for D will be the greatest among all the given options.

For Which of These Reactions Will the Difference Between Δ\DeltaΔ H ∘\circ∘

For Which of These Reactions Will the Difference Between $\Delta$ H^$\circ$