Using data from Exercise 43, determine the molarity of O₂ in an aqueous solution at equilibrium with air at normal atmospheric pressure. The volume percent of O₂ in air is 20.95%.

Exercise 43

Under an O₂(g) pressure of 1.00 atm, 28.31 mL of O₂(g) dissolves in 1.00 L H₂O at 25 °C. What will be the molarity of O₂ in the saturated solution at 25 °C when the O₂ pressure is 3.86 atm? (Assume that the solution volume remains at 1.00 L.)