How much energy is required for breaking a hydrogen bond?
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In water's hydrogen bonds, the hydrogen atom is covalently attached to the oxygen of a water molecule (492.2145 kJ ˣ mol-1 [350]) but has (optimally) an additional attraction (about 23.3 kJ mol-1 [168]. This is the energy (ΔH) required for breaking the bond and completely separating the atoms.
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