Chemical Engineering - Stoichiometry

6. 

80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is

A. 0.00
B. 0.18
C. 0.24
D. 1.00

Answer: Option B

Explanation:

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7. 

Atmospheric pressure corresponds to a hydrostatic head of

A. 13.6 cms of Hg
B. 34 ft ofH2O
C. 1 metre of H2O
D. 13.6 metres of Hg

Answer: Option B

Explanation:

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8. 

At a temperature of 0°K, the molecules of a gas have only __________ energy.

A. rotational
B. vibrational
C. translational
D. none of these

Answer: Option C

Explanation:

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9. 

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

A. 3 kmole/hr
B. 4 kmole/hr
C. 5 kmole/hr
D. 6 kmole/hr

Answer: Option C

Explanation:

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10. 

"The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface". This statement pertaining to the solubility of gases in liquid is the __________ law.

A. Raoult's
B. Henry's
C. Amgat's
D. none of these

Answer: Option B

Explanation:

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