Chemistry

Problem

Explain in one or two sentences why the molar enthalpy change for the vaporization of water at 100 °C (40.7 kJ mol⁻¹) is several hundred kilojoules smaller than the molar enthalpy change for the reaction 2 H₂O(l) → 2 H₂(g) + O₂(g) (571.6 kJ mol⁻¹).

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