A garage having a volume of 18 m3 is filled with 21% oxygen and 78% nitrogen by volume at atmospheric pressure. If the temperature of the air in the garage goes from 0 °C to 20 °C, what mass of air has left the garage? (At 0 °C, assume for air there are 22.4 liters/mole. Also, assume the pressure in the garage is constant.)

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