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a typical room is 4.0 m long, 5.0 m wide, and 2.5 m high. what is...

a typical room is 4.0 m long, 5.0 m wide, and 2.5 m high. what is the total mass of oxygen in the room assuming that the gas in the room is STP and that air contains 22% oxygen and 79% nitrogen?

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