In the older literature, results for oxygen concentrations are expressed in ml/liter. For example, the classic textbook The Oceans by Sverdrup, Johnson and Fleming (1942) reports that the oxygen concentration of tropical Atlantic surface water is 5.2 ml/L. a) Assuming that oxygen is an ideal gas, what is this value in mol O2/kg seawater?

b) Calculate the equilibrium concentration of oxygen in surface seawater under STP (25C, 1 atm) conditions. c) Is the tropical Atlantic surface water supersaturated, undersaturated or in equilibrium with the atmosphere according to the value given in The Ocean ? Why ?