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OpenStudy (anonymous):

what is the total mass in grams of oxygen in a room measuring 4.0 m by 5.0 m by 2.5 m? assume that the gas is at STP and that air contains 20.95% oxygen by volume

OpenStudy (jfraser):

you know the dimensions of the room, so find the total \(volume\) of the room, and use the density of air to find the total mass of air in the room. The oxygen makes up 20.95% of that total mass

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