Underwater, the pressure increases by 1 bar for every 10 m of depth. While a scuba diver breathes pressurized air in which the partial pressure of N2(g) exceeds 4 bar, the result is nitrogen narcosis, explain which is similar to alcohol intoxication. Explain what is the maximum mole percent of N2 in an air mixture that could be used by divers at depths up to 85 m below sea level without undue risk of nitrogen narcosis?