1. A scuba diving regulator allows a diver to breathe underwater by delivering air to the divers lungs at ambient pressure. Ambient pressure underwater is the sum of the water pressure and air pressure above. At a depth of 40 ft, a diving regulator delivers air at 2.2 atm. This increased pressure leads a divers body tissue, composed largely of water, to more rapidly absorb nitrogen, which can result in dangerous decompression sickness if the diver surfaces too quickly. Calculate the molar concentration of nitrogen in water at sea level (1 atm) and at a depth of 40 ft (2.2 atm) where the mole fraction of N₂ at 20C is 0.781 and K_N2 = 6.7 10⁴ mol/L atm. Calculate the percent change in dissolved nitrogen in water at sea level and at a depth of 40 ft.