Titanium (IV) oxide (TiO2) is the substance used as the white pigment in paint. It is prepared according to the following reaction: TiCl4 (s) + O2 (g) -----> TiO2 (s) + 2Cl2 (g) How much titanium (IV) chloride must react with excess oxygen to prepare 175 grams of the pigment if the reaction is only 85% efficient (% yield)