Stoichiometry
A chemical process is said to occur under unsteady state, if the

Inventory changes do not take place
None of these
Ratio of streams entering/leaving are independent of time
Flow rates & composition both are time dependent

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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. The rate of evaporation of aniline is 2.97 x 10⁻⁴. Its units are

Kmole/m² . s
Mole/s
Mole/cm². s
Mole/m² . s

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