Consider the following statements and choose the option that lists ALL the correct ones.

• Statement I: In an adiabatic process q = 0, so the change in internal energy equals the work done on the system (ΔU = wₐd).
• Statement II: The standard enthalpy of formation of O₃(g) is zero, because ozone is a form of the element oxygen.
• Statement III: Heat capacity of a sample is an extensive property, whereas its molar heat capacity is an intensive property.
• Statement IV: For N₂(g) + 3H₂(g) → 2NH₃(g) at constant temperature, with all gases behaving ideally, ΔH is less than ΔU.