Now molecules: molecules of H2 + molecules of O2 → molecules of H2O

Now molecules:

(2) molecules of H 2 +  (1) molecules of O 2 → (2) molecules of H 2 O

Explanation:

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"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."