Q. 594.7( 3 Votes )
saturation vapor pressure (SVP) at 27°C = 3600 Pa
Vapor pressure P=0.53600=1800Pa
Molar mass of water M=16+2=18g
Let m1 be the mass of water present in 50% humid air.
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.
Number of moles n=
Required pressure for saturation =3600Pa
Let m2 be the amount of water required for saturation.
Again, applying ideal gas equation
Total excess water vapor that must be added=m2-m1=26-13=13g.
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