stoichiometry chemical-engineering question and answers -Page 32

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Stoichiometry problems

1. A chemical process is said to occur under unsteady state, if the
Options
A. inventory changes do not take place.
B. ratio of streams entering/leaving are independent of time.
C. flow rates & composition both are time dependent.
D. none of these.

2. At 100�C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100�C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150�C is 4.69 atm. At 150�C, the vapour pressure of methylcyclohexane would be expected to be
Options
A. significantly less than 4.69 atm.
B. nearly equal to 4.69 atm.
C. significantly more than 4.69 atm.
D. indeterminate due to lack of data

4. Which of the following ratios defines the recycle ratio in a chemical process?
Options
A. Gross feed stream/recycle feed stream
B. Recycle stream/fresh feed stream
C. Recycle stream/gross feed stream
D. None of these

5. With increase in the temperature of pure (distilled) water, its
Options
A. pOH decreases and pH increases.
B. pOH and pH both 4ecreases.
C. pH and pOH both increases.
D. pH decreases and pOH increases.

7. An azeotropic solution of two liquids has boiling point lower than either of them, when it
Options
A. is saturated.
B. is unsaturated.
C. shows negative deviation from Raoult's law.
D. shows positive deviation from Raoult's law.

8. "The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements." This is the statement of
Options
A. Law of Petit and Dulong
B. Kopp's rule
C. Nearnst heat theorem
D. Trouton's rule

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