Scuba divers who descend more than 45 m below the surface may use a gas mixture called Trimix to support their breathing. Trimix is available in several different concentrations, including 11.7% He, 56.2% N2, and 32.1% O2, by mass. This mixture of gases avoids high concentrations of dissolved nitrogen in the blood at great depth, which can lead to nitrogen narcosis, a potentially deadly condition for divers. Calculate the mole fraction of each gas in this mixture.