AP-level Chemistry challenge question:
Permanganic acid (350 ml of a 2.0M aqueous solution) is reacted with 2.0 L of 2.0 N hydrochloric acid, producing aqueous manganese (II) chloride and chlorine gas. The hydrochloric acid was made with pure radioactive chlorine-33, which has a half-life of 37.24 minutes and undergoes β− decay. The reaction is conducted in a sealed 25 L vessel at an initial pressure of 99.5 kPa. The vessel is kept at a constant temperature of 25°C throughout the reaction. What is the pressure inside the vessel after 75 minutes? What assumptions need to be made when solving this problem?