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Question 1 of 7
1. Question1 pointsCategory: MASS TRANSFER
A binary liquid mixture of benzene and toluene contains 20 mol % of benzene. At 350 K the vapor pressures of pure benzene and pure toluene are 92 kPa and 35 kPa, respectively. The mixture follows Raoult”s law. The equilibrium vapor phase mole fraction (rounded off to the second decimal place) of benzene in contact with this liquid mixture at 350 K is ________.Correct
Question 2 of 7
2. Question1 pointsCategory: MASS TRANSFER
Match the dimensionless numbers in Group-1 with the ratios in Group-2.Correct
Question 3 of 7
3. Question1 pointsCategory: MASS TRANSFER
For what value of Lewis number, the wet-bulb temperature and adiabatic saturation temperature are nearly equal?Correct
When lewis number is unity, the wet-bulb temperature and adiabatic saturation temperature are equal.Incorrect
When lewis number is unity, the wet-bulb temperature and adiabatic saturation temperature are equal.
Question 4 of 7
4. Question2 pointsCategory: MASS TRANSFER
A binary distillation column is to be designed using McCabe Thiele method. The distillate contains 90 mol% of the more volatile component. The point of intersection of the q-line with the equilibrium curve is (0.5, 0.7). The minimum reflux ratio (rounded off to the first decimal place) for this operation is __________.Correct
Question 5 of 7
5. Question2 pointsCategory: MASS TRANSFER
Solute C is extracted in a batch process from its homogenous solution of A and C, using solvent B. The combined composition of the feed and the extracting solvent is shown in the figure below as point M, along with the tie line passing through it. The ends of the tie line are on the equilibrium curve.
What is the selectivity for C?Correct
Question 6 of 7
6. Question2 pointsCategory: MASS TRANSFER
At 30ºC, the amounts of acetone adsorbed at partial pressures of 10 and 100 mmHg are 0.1 and 0.4 kg acetone/kg activated carbon, respectively. Assume Langmuir isotherm describes the adsorption of acetone on activated carbon. What is the amount of acetone adsorbed (in kg per kg of activated carbon) at a partial pressure of 50 mmHg and 30ºC?Correct
Question 7 of 7
7. Question2 pointsCategory: MASS TRANSFER
Consider the following two cases for a binary mixture of ideal gases A and B under steady state conditions. In Case 1, the diffusion of A occurs through non-diffusing B. In Case 2, equimolal counter diffusion of A and B occurs. In both the cases, the total pressure is 100 kPa and the partial pressures of A at two points separated by a distance of 10 mm are 10 kPa and 5 kPa. Assume that the Fick‟s first law of diffusion is applicable. What is the ratio of molar flux of A in Case 1 to that in Case 2?Correct
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