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(Part I) A scuba diver prepares his gear for a deep sea dive by making a tank of compressed gases

Chemistry

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(Part I) A scuba diver prepares his gear for a deep sea dive by making a tank of compressed gases. The tank is 10.0L, pressured to 12.0 atm, and temperature of 25.0^oC. If the tank is filled with Trimix that consists of 10% oxygen, 70% helium, and 20% nitrogen, calculate the grams of each gas in the gas mixture. 

(Part II.) What would be the density of the gas mixture at 25.0^oC (hint: use a weighted average formula of the molar mass of each gas)?