1) Answer 2) On a Txy or Hxy diagram, a \'tie line\' .... (select all that apply

Question

1)

Answer

2)

On a Txy or Hxy diagram, a 'tie line' .... (select all that apply)

Answer

is an isotherm - a line of constant temperature.

connects two points in equilibrium, one on the saturated vapor line, the other on the saturated liquid line

can be used with the inverse lever rule to estimate the relative amounts of liquid and vapor present at equilibrium, if the overall (or feed) composition is known.

can be used to calculate the enthalpy of vaporization

5)

An equilibrium flash (generation of vapor from liquid and/or generation of liquid from vapor) occurs on each stage in a distillation column because...

colder liquid mixes with hotter vapor to produce equilibrium products at an intermediate temperature

the liquid and vapor that meet on the stage have different compositions.

liquid and vapor mix, and the total pressure drops as a result

hot liquid mixes with colder vapor producing equilibrium products at an intermediate temperature

8)

The assumption of CMO means that ... (select all that apply)

we can ignore the energy balance in our calculations

the temperatures of the liquid and vapor streams do not change

for every mole of vapor that condenses, one mole of liquid evaporates

the compositions of the liquid and vapor streams do not change

9 The temperature of the vapor leaving the stage is

a. liquid mixtures are always ideal. b. the boiling point of a liquid mixture is always between the boiling points of the pure components. c. at equilibrium the chemical potential of each component in a mixture is the same in both the vapor and liquid phases. d. chemical engineers like to use Greek letters for anything they don't understand.

Explanation / Answer

1) c.

at equilibrium the chemical potential of each component in a mixture is the same in both the vapor and liquid phases

2)

are easily predicted from theory.

3)

there is no volume change on mixing, i.e., mixing 10 cc of A with 10 cc of B produces 20 cc of a solution of A and B.

4)

c.

can be used with the inverse lever rule to estimate the relative amounts of liquid and vapor present at equilibrium, if the overall (or feed) composition is known.

5)

d.

a component mass balance, put in the form of the equation of a straight line, i.e., y = mx + b.

6)

b.

is only accurate when care is taken when creating the graph

7)

c.

liquid and vapor mix, and the total pressure drops as a result

8)

c.

for every mole of vapor that condenses, one mole of liquid evaporates

9)

lower ,higher ,equal to , intermediate

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