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Stoichiometry

Stoichiometry
Disappearance of snow in subzero weather exemplifies the process of

Evaporation
Sublimation
Vaporisation
Melting

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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. Its units are

Cm/s
Mole/m².s.Pa
Kmole/m².s.Pa
M/s

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Stoichiometry
Which of the following gravity scales is used exclusively for liquids heavier than water?

None of these
API scale
Twaddel scale
Baumme scale

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Stoichiometry
Solutions having the same osmotic pressure are called __________ solutions.

Dilute
Ideal
Isotonic
Saturated

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Stoichiometry
The vapor pressure of a substance, at its melting point, is __________ in the solid state as compared to that in the liquid state.

More
Same
Less
Either A or B; depends on the nature of the substance

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Stoichiometry
A butane isomerisation process produces 70 kmole/hr of pure isobutane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be

4 kmole/hr
6 kmole/hr
3 kmole/hr
5 kmole/hr

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