Equations of State, Single Component Two-Phase Systems, Saturation and Condensation

This quiz contains multiple-choice problems on state equations, vapour pressure modelling and prediction, and saturation and condensation concepts.

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100 KPa of water vapour at 27 °C is saturated with air in a system. What is the mole fraction of air?

0.230

0.306

0.425

0.503

10 KPa of water vapour at 27 °C is saturated with air in a system. What is the mole fraction of air?

0.21

0.46

0.79

0.91

If the fraction of water vapour at 27 °C and 5 atm is 0.5, what is the fraction of water vapour at 27 °C and 1 atm?

0.1

0.2

0.5

0.8

What is the fraction of water vapour at 27 °C and 1 atm if the fraction of water vapour at 127 °C and 1 atm is 0.8?

0.2

0.4

0.6

0.8

A container has H{2}O vapour with a partial pressure of 9 atm. What is the fraction of air in the vessel?

0.1

0.4

0.7

0.9

Ethanol is burnt with the required amount of O{2} at atmospheric pressure; the conversion of ethanol is 100%. What is the pressure at due point?

0.2 atm

0.4 atm

0.6 atm

0.8 atm

Ethane is burnt with 20% excess O{2} at 2 atm, and its conversion rate is 50%. What is the pressure at due point?

0.45 atm

0.75 atm

0.9 atm

1 atm

CH{4} is burnt with 100% excess O{2} at atmospheric pressure. If CH{4} conversion is 100%, what is the pressure at dew point?

0.2 atm

0.4 atm

0.6 atm

0.8 atm

A system’s partial pressure at 49 °C is 125 mmHg, and saturated ammonia vapour has a partial pressure of 20 mmHg at 49°C. What is the fraction of ammonia vapour in the system?

0.04

0.08

0.16

0.24

A system has a partial pressure of 500 mmHg, and the saturated water vapour has a partial pressure of 25 mmHg. What is the fraction of water vapour in the system?

0.01

0.05

0.1

0.5

A vessel contains air and vapour H{2}O. If the partial pressure of vapour H{2}O is 4 atm and air pressure is 1 atm, what is the fraction of vapour H{2}O in the vessel?

0.25

0.5

0.75

0.8

What is the dew point of water under standard conditions?

32 °F

212 °F

372 °F

584 °F

Which of the following describes condensation?

Change of solid to vapour

Change of vapour to liquid