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Home Chemical Engineering Stoichiometry See What Others Are Saying!
  • Question
  • 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


  • Options
  • A. mole/s
  • B. mole/cm2. s
  • C. mole/m2 . s
  • D. kmole/m2 . s

  • Correct Answer
  • kmole/m2 . s 


  • More questions

    • 1. Carbon/hydrogen ratio (by weight) is maximum (out of following) for

    • Options
    • A. gasoline
    • B. kerosene
    • C. light gas oil
    • D. heavy fuel oil
    • Discuss
    • 2. Salt content in sea water is about __________ percent.

    • Options
    • A. 0.5
    • B. 1
    • C. 3.5
    • D. 10
    • Discuss
    • 3. Refractoriness/fusion points of 'superduty' refractories is __________ °C.

    • Options
    • A. 1520-1630
    • B. 1630-1670
    • C. > 1730
    • D. > 2000
    • Discuss
    • 4. Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds

    • Options
    • A. 4000
    • B. 2100
    • C. 1500
    • D. 3000
    • Discuss
    • 5. Plastic tubes & pipes are generally made by __________ moulding.

    • Options
    • A. injection
    • B. transfer
    • C. extrusion
    • D. compression
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    • 6. pH value of soil is maintained at __________ by the addition of fertiliser for optimum growth and health of the plant.

    • Options
    • A. 4-5
    • B. 7-8
    • C. 9-10
    • D. 12-13
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    • 7. Sphericity of pulverised coal is

    • Options
    • A. 1
    • B. <1
    • C. >1
    • D. ?
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    • 8. Coolant used in a boiling water reactor is

    • Options
    • A. hydrogen gas
    • B. water
    • C. steam
    • D. a mixture of water & steam
    • Discuss
    • 9. Gasoline yield in catalytic reforming of naphtha may be about __________ percent by weight.

    • Options
    • A. 85
    • B. 65
    • C. 50
    • D. 98
    • Discuss
    • 10. Reciprocal of sphericity is termed as the

    • Options
    • A. specific surface ratio
    • B. shape factor
    • C. sauter diameter
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