1)glass laboratory flask is filled with gas at 31°C and 0.95 atm pressure,?
sealed, and then heated to 111°C. What is the pressure inside the flask?
2) A typical room is 4.0 m long, 5.2 m wide, and 2.3 m high. What is the total mass of nitrogen in the room assuming that the gas in the room is at STP and that air contains 21% oxygen and 79% nitrogen?
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Verified answer
0.95 / 304 K = p2 / 384 K
p2 = 1.2 atm
V = 4.0 x 5.2 x 2.3 =47.84 m^3 => 47840 dm^3
volume N2 = 47840 x 79/100=37793.6 L
moles N2 = 37793.6/ 22.4 =1687
mass N2 = 1687 mol x 28.02 g/mol=4.73 x 10^4 g