Q. 565.0( 1 Vote )
50 cc of oxygen is collected in an inverted gas jar over water. The atmospheric pressure is 99.4 kPa and the room temperature is 27°C. The water level in the jar is same as the level outside. The saturation vapor pressure at 27°C is 3.4 kPa. Calculate the number of moles of oxygen collected in the jar.
Volume of oxygen = 50cc=50cm3=50
Atmospheric pressure Po=99.4kPa=99.4Pa
Saturation vapor pressure Ps=3.4kPa=3.4Pa
According to question water level in the jar is same as level outside. So
Pressure inside the jar = pressure outside the jar
Pressure outside the jar =atmospheric pressure Po
Pressure inside the jar=Po …. (1)
Pressure inside the jar is also = vapor pressure of oxygen+ Saturation vapor pressure
Pressure inside the jar=P+Ps …. (2)
From equation (1) and (2), we can write
Applying ideal gas equation
Where V= volume of gas
R=gas constant =8.3JK-1mol-1
n=number of moles of gas
P=pressure of gas.
The number of moles of oxygen collected in the jar is 1.9310-3.
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