To determine the Molar Volume of a Gas @ STP, a tube containercontaining potassium chlorate and manganese (IV) oxide, weighing atotal of 6.980g, was heated until its mass dropped to 6.190g. By water displacement method, 625 mL of oxygen gas was collected overwater at 20 Celsius when atmospheric pressure was 720 torr. From this data, what is the experimentally determined Molar Volume of oxygen at STP?