Prelim Flashcards

1
Q

The total Gibbs Free Energy for all phases in a multiphase, multicomponent system is

A

Minimum

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2
Q

The ratio of mole fractions of a species present in liquid-liquid equilibrium

A

distribution coefficient

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3
Q

For non ideal liquid solutions the model for correlating liquid-phase activity coefficients of binary pairs that uses local area fraction as the primary concentration variable rather than local volume or mole fractions

A

UNIQUAC

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4
Q

A solution is ideal when activity coefficients are all equal to

A

1

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5
Q

Fugacity as a substitute for chemical potential in phase equilibria calculations was proposed by

A

Lewis

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6
Q

For systems in equilibrium, the given species in each existing phase has equality of phase

A

chemical potential

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7
Q

Graphical correlations of pure component thermodynamic properties are widely available for an solution at near

A

Ambient Pressure

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8
Q

The approximate expression for estimating K-value for non ideal liquid solutions at moderate pressure and below the critical temperature

A

Poynting correction

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9
Q

The ratio for the equilibrium ratios for vapor-liquid systems is the

A

Relative Volatility

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10
Q

For a pure ideal gas, fugacity is equal to

A

Pressure

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11
Q

Equation that provides the quantitative measure of the thermodynamic inefficiency of the process

A

Availability Balance

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12
Q

Dissolving pharmaceutical products from bark or roots of plants employs

A

Leaching

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13
Q

For non ideal vapor and liquid mixtures containing non polar components which of the following equations can be used to estimate activity coefficients, volume and Enthalpy of mixing and K values

A

SR
PR
LKP
So All of these

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14
Q

The equivalent work of separation for an irreversible process is given by

A

Lost work + Minimum work

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15
Q

Which of the following describes activity

A

ratio of partial fugacity of a component to its fugacity in some defined standard state

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16
Q

Which of the following equations of state for non ide vapor and liquid mixtures does not use acentric factor

A

Redlich-Kwong

17
Q

For a pure ideal gas, fugacity equals

A

Total Pressure

18
Q

Which is true about lost work in a separation operation

A

the greater its value the greater the energy inefficiency

19
Q

The simplest model of when both vapor and liquid are ideal solutions and the vapor is an ideal gas applies only at near ambient pressure up to about

20
Q

Which is not true about availability

A

is conserved in a real irreversible process

21
Q

Fick’s law of Diffusion is an extension of

A

Fourier’s Law of heat conduction

22
Q

Which of the following is not true about binary equimolar counterdiffusion

A

at constant molar density Dab = - Dba

23
Q

For equimolar mixture of A and B, in unimolecular diffusion, mass transfer of component A in stagnant B, if 1 - Xa is 0.5, then

24
Q

For estimating the diffusivity in gas mixtures, which of the following equations can be used

A

Chapman-Enskog Equation

25
The Nernst-Haskell equation is used to estimating diffusion coefficients of
electrolytes
26
For steady state, one dimensional molecular diffusion through stationary medium B, with constant DAB, the molar rate of mass transfer of A for plane wall is proportional to, EXCEPT
thickness ( it is proportional to diffusivity, area, and concentration gradient)
27
The model for mass transfer at fluid-fluid interface most useful when mass transer involves bubbles or droplets or flow over random packing
Penetration theory
28
The total molar rate of absorption of A through a falling liquid film B is directly proportional to
film thickness film width concentration gradient
29
The mass transfer coefficient for component A is given by
kc = nA/A∆CA
30
Used to estimate the values of heat and mass transfer coefficients from experimental measurements of the Fanning friction factor for turbulent flow at Npy= Nsc= 1
Reynolds Analogy