Stoichiometry
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

Cm/s
Mole/m².s.Pa
M/s
Kmole/m².s.Pa

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Stoichiometry
Pick out the wrong unit conversion of thermal conductivity.

1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K
1 BTU/ft².hr.°F/inch = 1.488 kcal/m². hr.°C/m
1 BTU/ft².hr.°F/ft = 1.488 kcal/m². hr.°C/m
1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F

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