Your chemical storage room has a large bottle of a chemical with part of the label missing . From the rest of the label, you deduce it must contain an alkali metal sulfate. The question is, which one? The key is to deter mine its molar mass. You recall that barium sulfate is insoluble , so you undertake a gravimetric analysis to find out the unknown alkali metal You weigh out 0.872 g of the compound, dissolve it in waterand add bar ium chloride solution until no more precipitate is formed. You filter off and dry the precipitate. The mass of the precipitate is 1.167 g. If the unknown alkali metal is represented by the symbol X, then the double displacement reaction is: X 2 SO 4 (aq)+BaCl 2 (aq) BaSO 4 (s)+2* Cl(aq)