Chemical Engineering - Stoichiometry

1. 

The heats of vaporisation of CS2, C2H5OH &H2O are 26.8, 38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is

A. H2O > C2H5OH > CS2
B. CS2 > C2H5OH > H2O
C. H2O > CS2 > C2H5OH
D. CS2 > H2O > C2H5OH

Answer: Option A

Explanation:

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2. 

A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal

A. kinetic energy.
B. intermolecular forces of attraction.
C. potential energy.
D. total energy.

Answer: Option A

Explanation:

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3. 

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

A. m/s
B. cm/s
C. mole/m2.s.Pa
D. kmole/m2.s.Pa

Answer: Option C

Explanation:

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4. 

If 1.5 moles of oxygen combines with aluminium to form Al2O3, then the weight of aluminium (atomic weight = 27 ) used in this reaction is __________ gm.

A. 27
B. 54
C. 5.4
D. 2.7

Answer: Option B

Explanation:

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5. 

The unit of dynamic viscosity is

A. stoke
B. poise
C. gm/cm sec.
D. both (b) & (c)

Answer: Option D

Explanation:

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