GKFix MCQ Question

Which of the following reactions is associated with the standard enthalpy of reaction?

• A. CH₄(l) + 2O₂(g) → CO₂(g) + 2H₂O(l)
• B. CH₄(g) + O₂(g) → CO₂(g) + H₂O(l)
• C. CH₄(g) + 2O₂(l) → CO₂(g) + 2H₂O(l)
• D. CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)