How do water molecules move away from their H-O-H configuration to become new molecules?

The water molecules move away from their H-O-H configuration to become new molecules as the weak hydrogen bonds are constantly being broken and re-formed.

A water molecule is composed of two atoms of hydrogen and one atom of oxygen. Oxygen shares one of its outer electrons with each of two hydrogen atoms, and each of the two hydrogen atoms share their only electrons.

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A water molecule is consists of two hydrogen atom, each bound to the central oxygen atom through a covalent chemical bond.

Water molecules can form new molecules by moving away from their H-O-H configuration due to thermal motions and rotations. Thermal motions and rotations break the individual hydrogen bonds and change the  H-O-H configuration influenced by the temperature and pressure.

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a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.