Oxides of sodium and potassium are converted into chlorides according to the following reactions :Na2​O+2HCl⟶2NaCl+H2​OK2​O+2HCl⟶2KCl+H2​O​Finally all the chlorides of NaCl and KCl are converted into AgCl, hencemoles of (NaCl+KCl)= moles of AgCl(one mole of either NaCl or KCl gives one mole of AgCl )Now, let the chloride mixture contain x gNaCl.⇒58.5x​+74.50.118−x​=143.50.2451​Solving for x gives x=0.0338 g (mass of NaCl )⇒ Mass of KCl=0.118−0.0338=0.0842 gAlso, moles of Na2​O=21​× moles of NaCl⇒ Mass of Na2​O=21​×58.50.0338​×62=0.0179 gSimilarly, mass of K2​O=21​×74.50.0842​×94=0.053 g⇒ Mass % of Na2​O=0.50.0179​×100=3.58%Mass % of K2​O=0.50.053​×100=10.6%