What mass of water is decomposed by electrolysis (yield of hydrogen in electrolysis reaction is only Y1 = 77.9%), if it is known that all produced hydrogen was used to make 269 g of hydrogen chloride, and the yield of HCl in the production reaction is Y2 = 63%? Oxygen and chlorine are in excess. Balanced chemical equations of the reactions are:

2H2O → 2H2 + O2 Y1% yield
H2 + Cl2 → 2HCl Y2% yield