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bond energy for water 2xH-O 968Kj/18g
also note that hydrogen bonding is a special type of van der waals interaction between molecules not the O-H bonds.. http://www1.lsbu.ac.uk/water/hbond.html
that's why it's hard to get the energy you spend back from electrolysis.. with bigger temperature and magnetic field there's less hydrogen bonding in water.
less energy required to make hydrogen