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 171 g of potassium chlorate reacts in a 2.70-L vessel, which was initially evacuated, what pressure of oxygen will be attained when the temperature is finally cooled to 25°C? Use the preceding chemical equation and ignore the volume of solid product.