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Chemical Engineering :: Stoichiometry

  1. S.T.P. corresponds to

  2. A.

     1 atm. absolute pressure & 15.5°C

    B.

     760 mm Hg gauge pressure & 15.5°C

    C.

     760 torr & 0°C

    D.

     101.325 kPa gauge pressure & 15.5°C

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  3. The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is

  4. A.

     0.4

    B.

     0.6

    C.

     0.8

    D.

     0.2

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  5. Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

  6. A.

     Sizes of the component molecules are approximately equal

    B.

     Attractive forces between like and unlike molecules are approximately equal

    C.

     Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution

    D.

     All of the above

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  7. Kopp's rule is useful for the determination of

  8. A.

     Molal heat capacities of gases

    B.

     Heat capacities of solids

    C.

     Activation energy

    D.

     Heat capacities of gases

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  9. Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10⁻³ T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is

  10. A.

     10.73 kJ

    B.

     16.15 kJ

    C.

     18.11 kJ

    D.

     18.33 kJ

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  11. A sugar solution containing __________ percent sugar is equivalent to 1 Brix.

  12. A.

     0.01

    B.

     0.1

    C.

     1

    D.

     10

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  13. Methane is mixed with stoichiometric proportion of oxygen and completely combusted. The number of additional specifications required to determine the product flow rate and composition is

  14. A.

     0

    B.

     1

    C.

     2

    D.

     3

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  15. The heat of solution depends upon the

  16. A.

     Nature of solvent

    B.

     Concentration of solution

    C.

     Nature of solute

    D.

     All of the above

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  17. 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

  18. A.

     3 kmole/hr

    B.

     4 kmole/hr

    C.

     5 kmole/hr

    D.

     6 kmole/hr

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  19. Molar heat capacity of water in equilibrium with ice at constant pressure is

  20. A.

     0

    B.

     ∞

    C.

     1

    D.

     None of these

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