Question Detail
Question
The value of enthalpy change for a reaction is affected by:
Correct Answer
Option B is the correct answer.
Detailed Explanation
Enthalpy change (ΔH) is a state function and depends on the initial and final states. The physical states (solid, liquid, gas) are part of defining that state, as they have different inherent enthalpies. A catalyst, activation energy, and reaction rate do not affect the overall ΔH.
Hint
Enthalpy is a state function. What factors define the state of a substance?