A certain dry mixture contains only three compounds- silver nitrate, magnesium chloride, and barium nitrate. When 1.253 g of the mixture was added to excess water, 0.114 g of dry precipitate was recovered by filteration. The solution which passed through the filter was collected in a beaker and excess sodium sulfate solution was added to this beaker. 0.432 g of fry precipitate was collected from this second solution by filtration. Calculate the percent of magnesium chloride in the original mixture.