Which represents an enthalpy change at 25 °C and 1 atm that is equal to ΔH^o_ffor H₂O(l)? A) O₂(g) + 2H₂(g) → 2H₂O(l) B) ½O₂(g) + H (g) → H₂O(g) C) H₂(g) + ½O₂(g) → H₂O(l) D) 2H₂O(l) → O₂(g) + 2H₂(g) E) H₂O(l) → ½O₂(g) + H₂(g)

Question

Quizplus · Accepted Answer

The given enthalpy change ΔH^o_f is for the reaction H₂(g) + ½O2(g) → H₂O(l). This means that 1 mole of H₂(g) and ½ mole of O2(g) react to form 1 mole of H₂O(l) at standard conditions. Following the stoichiometric coefficients in the given answer choices, only option C represents the same reaction with the enthalpy change at standard conditions. Therefore, it is the best choice.

Which Represents an Enthalpy Change at 25 °C and 1