When people dive into deep water, the pressure exerted by the water above can become great enough to collapse their lungs. Hence, scuba gear must sense the external pressure and increase the pressure of the breathing mixture provided to the diver until it equals the external pressure. A diver exploring a sunken ship uses an oxygenenriched breathing mixture of 36% oxygen and 64% nitrogen by mass. At a depth of 33 ft, the pressure on the diver is 2.0 bar. What is the partial pressure of oxygen in the breathing mixture at that depth?