Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3 . The diffusivity of aniline in air is 0.74xl0-5m2/s.The numerical value of mass transfer co-efficient is 7.4 x 10-3. Its units are
Options
A. m/s
B. cm/s
C. mole/m2.s.Pa
D. kmole/m2.s.Pa
Correct Answer
mole/m2.s.Pa
More questions
1. Cellulose content in bomboo fibre is about __________ percent.
5. For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell
Options
A. decreases upwards.
B. increases upwards.
C. remains same throughout.
D. may decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell.
6. Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop.