Liquid oxygen was first prepared by heating potassium chlorate, KClO3, in a closed vessel to obtain oxygen at high pressure. The oxygen was cooled until it liquefied.
2KClO3(s) → 2KCl(s) + 3O2(g)
If 170. g of potassium chlorate reacts in a 2.50-L vessel, which was initially evacuated, what pressure of oxygen will be attained when the temperature is finally cooled to 25oC? Use the preceding chemical equation and ignore the volume of solid product.