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You need to login to ask any Questions from chapter Interphase-Mass-Transfer of Mass-Transfer

Chapter:

Interphase-Mass-Transfer

1. Diffusion of components between phases at equilibrium is

Zero Infinity Changes continuously Diffusion never occurs

Zero

At equilibrium, concentration becomes uniform so rate of diffusion stops.

Hint Answer

2. The operating line will be straight if its concentrations are represented in mole ratio.

True False

True

The non- diffusing solute remains same throughout process. So re is a straight operating line.

Hint Answer

3. Consider a steady-state condition; concentration at any point in equipment never changes with time.

True False

True

Generally at a steady state, net transfer remains same so concentration will be same at every point.

Hint Answer

4. Find operating line slope

$Find operating line slope\r\n \r\nWhere, X,Y- concentration in mole ratio of liquid and gas phase\r\n x,y-concentration in mole fraction\r\n Gs,Ls- mole free basis( non-diffusing solvent)$

Where, X,Y- concentration in mole ratio of liquid and gas phase
x,y-concentration in mole fraction
Gs,Ls- mole free basis( non-diffusing solvent)

Ls/Gs –Ls/Gs Gs/Ls –Gs/Ls

–Ls/Gs

Gs(Y1)+Ls(X1)= Gs(Y2)+Ls(X2)
Gs(Y1-Y2)= Ls(X2-X1)
Y2-Y1= -Ls/Gs(X2-X1)
Slope of operating line is ?Ls/Gs.

Hint Answer

5. According to Lewis and Whitman ory, departure from concentration equilibrium at Interphase is due to

Low mass transfer rates High mass transfer rates Moderate mass transfer rate None of the mentioned

High mass transfer rates

Theoretically proved by Lewis and Whitman, that if mass transfer rates are higher concentration deviates from equilibrium.

Hint Answer

6. The figure given below is a single stage ideal co- current process of solute transfer from liquid to gas phases.

$The figure given below is a single stage ideal co- current process of solute transfer from liquid to gas phases.\r\n$

True False

True

if operating line touches equilibrium line n stage is an ideal one. Also here only single operating line so it is a single stage.

Hint Answer

7. Name of line PR and QT

$Name of line PR and QT\r\n \r\n If X, Y – are represented in mole ratio$

If X, Y – are represented in mole ratio

Interface line Driving force line Parallel line Normal line

Driving force line

The distance from Interphase is known as Driving force line.

Hint Answer

8. The real driving force of mass transfer is

Chemical potential Physical potential Pressure gradient Concentration gradient

Chemical potential

Chemical potential represents dynamic equilibrium of mass transfer.

Hint Answer

9. Assume an ideal solution with pure component A, has a vapour pressure of 300 mmHg and total pressure of 1atm. The concentration in terms of mole ratio is

0.65 0.28 0.39 None of the mentioned

0.65

According to Rauolt?s law, for an ideal solution
Total pressure= concentration x vapour pressure
Concentration in mole fraction=300/760 =0.39
Concentration in mole ratio = 0.39/(1-0.39)=0.65.

Hint Answer

10. Find abscissa and ordinates of graph

$Find abscissa and ordinates of graph\r\n \r\nIf X,Y –Concentration in mole ratio\r\nx,y- Concentration in mole fraction$

If X,Y –Concentration in mole ratio
x,y- Concentration in mole fraction

X,y X,Y x,y x,Y

x,y

In diagram, operating line is a curve, only if concentration is expressed in mole fraction operating line is a curve.

Hint Answer

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from Mass-Transfer

Modes and Diffusion

Modes and Diffusion

Interphase Mass Transfer

Interphase Mass Transfer

Equipment for Gas-Liquid Operations

Equipment for Gas-Liquid Operations

Humidification Operations

Humidification Operations

Gas Absorption

Distillation

Liquid Extraction

Liquid Extraction

Drying

Leaching and Mass Transfer Co-efficients

Leaching and Mass Transfer Co-efficients

Diffusion in Solids and Molecular Diffusion in Fluids

Diffusion in Solids and Molecular Diffusion in Fluids

Topics

This Chapter Interphase-Mass-Transfer consists of the following topics

Interphase Mass Transfer

Diffusion of components between phases at equilibrium is

The operating line will be straight if its concentrations are represented in mole ratio.

Consider a steady-state condition; concentration at any point in equipment never changes with time.

Find operating line slope

$Find operating line slope\r\n \r\nWhere, X,Y- concentration in mole ratio of liquid and gas phase\r\n x,y-concentration in mole fraction\r\n Gs,Ls- mole free basis( non-diffusing solvent)$

Where, X,Y- concentration in mole ratio of liquid and gas phase
x,y-concentration in mole fraction
Gs,Ls- mole free basis( non-diffusing solvent)

;

According to Lewis and Whitman ory, departure from concentration equilibrium at Interphase is due to

The figure given below is a single stage ideal co- current process of solute transfer from liquid to gas phases.

$The figure given below is a single stage ideal co- current process of solute transfer from liquid to gas phases.\r\n$

;

Name of line PR and QT

$Name of line PR and QT\r\n \r\n If X, Y – are represented in mole ratio$

If X, Y – are represented in mole ratio

;

The real driving force of mass transfer is

Assume an ideal solution with pure component A, has a vapour pressure of 300 mmHg and total pressure of 1atm. The concentration in terms of mole ratio is

Find abscissa and ordinates of graph

$Find abscissa and ordinates of graph\r\n \r\nIf X,Y –Concentration in mole ratio\r\nx,y- Concentration in mole fraction$

If X,Y –Concentration in mole ratio
x,y- Concentration in mole fraction

;

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