When strongly electronegative atoms, like fluorine, bond to atoms with a lower electronegativity, like hydrogen, what's the result?

When highly electronegative element like oxygen is directly attached to less electronegative element like hydrogen the electrons from less electronegative elements are attracted toward the highly electronegative element, making the less electronegative element deficient in electron density (partial positive) and a partial negative charge on more electronegative element is created. In such situation the intermolecular forces formed are dipole-dipole interactions or hydrogen bond interaction like in HF.

The answer is !

The mass has escaped into a gas which you can not see so the law stays true.