A solvent is evaporating into stagnant air with a constant molar flux of 0.05 mol/m2-s, and at a certain pointin the gas phase within the cylinder the concentration of the solvent is 5.0 mol/m3 and the concentration ofthe air is 36 mol/m3. WRF Fig 24.1 is a simple illustration of this evaporation process. Note that “stagnant” means that the flux of air is zero. Also note that since air has a defined composition it is typical to treat it as a single species rather than as a mixture of nitrogen and oxygen. Thus the physical properties of “air” are widely tabulated. From this information, calculate the following z-velocities, using the z-coordinate as the vertical direction:a) The molar velocity of the solvent vapor in the z-direction.b) The molar velocity of the air in the z-direction.c) The molar average velocity at the given point.
A solvent is evaporating into stagnant air with a constant molar flux of 0.05 mol/m2-s, and at a certain point
in the gas phase within the cylinder the concentration of the solvent is 5.0 mol/m3 and the concentration of
the air is 36 mol/m3. WRF Fig 24.1 is a simple illustration of this evaporation process. Note that “stagnant” means that the flux of air is zero. Also note that since air has a defined composition it is typical to treat it as a single species rather than as a mixture of nitrogen and oxygen. Thus the physical properties of “air” are widely tabulated. From this information, calculate the following z-velocities, using the z-coordinate as the vertical direction:
a) The molar velocity of the solvent vapor in the z-direction.
b) The molar velocity of the air in the z-direction.
c) The molar average velocity at the given point.
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