The surface area of the floor of a room is 40 m2 and the walls are 3
m high. If the room temperature is 27°C and pressure is 1 atm,
T= 300k
then find the mass of the air inside the room.
[Given: molecular weight of air =29, 1 atm = 1.013 X 105 Pa, R
= 8.31) mol-1 K-11
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Answer:
At STP, Temperature = 273K and Pressure=1atm, diameter=3 Å =3x10-8 cm.
Actual volume by 1mole O2 gas at STP =22.4l = 22400cm3.
Molecular volume of O2 = ((4/3) πr3) x NA
= (4/3) x 3.14x (1.5x10-8)3x6.02x1023 =8.51cm3
Therefore, Ratio = (8.51/22400) = 3.8x10-4
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