63. A mixture of aluminum chloride and chromium (III) weighing 317 g were treated first with excess potassium hydroxide, and then - the excess chlorine water. To this solution was surged excess barium nitrate formed with 126.5 g of a yellow solid. Calculate the mass fraction of chromium chloride (III) in the starting mixture.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)