# Two-Phase Gas-Liquid Systems, Gibbs's Phase Rule and Vapour-Liquid Equilibria

This quiz contains multiple-choice problems on partial saturation terminology and material balance problems, Gibbs’s phase rule and vapour-liquid equilibria in binary systems.

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Which of the following is defined as the ratio of partial and vapour pressures?

Relative humidity

Molal humidity

Humidity

None of the above

What is the relative humidity of a gas with a partial pressure of water vapour 360 Pa and vapour pressure 1 atm?

100%

225.1%

355.4%

405.9%

What is the molal saturation of a gas with 10 moles of gas vapour and 25 moles of dry gas?

0.2

0.4

0.8

1

What is the molal saturation of a gas with 10 Pa partial pressure without vapour and 0.5 atm partial pressure with vapour?

0.5

1

5

101.3

What is the humidity if there are 25 moles of dry gas and 15 moles of water vapour?

60%

90%

150%

200%

What are moles of dry gas if the moles of water vapour is 14 at 25% humidity?

3.5

7

14

56

What is the degree of freedom of a system with 2 phases and one component?

1

2

3

4

What is the humidity if the dry gas and water vapour masses are 10 kg and 5 kg, respectively?

25%

50%

100%

200%

What is the molal humidity of a gas with partial pressure 1 mmHg with vapour and partial pressure 1 atm without vapour?

90%

131%

214%

288%

What is the molal humidity of a gas with pressure of gas vapour 10 mm Hg and pressure of vapour free gas 20 mmHg?

25%

50%

100%

200%

What is the relative saturation of a gas with partial pressure 38 mmHg and vapour pressure 1 torr?

0.05

0.5

2

38

What is the relative humidity of a gas with a partial pressure of water vapour 5 mmHg and vapor pressure 8 mmHg?

25%

32.5%

45%

62.5%

What is the relative saturation of a gas with partial pressure 10 mmHg and vapour pressure 5 mmHg?

0.5

1

2

4

What is the degree of freedom of a system with a mixture of water, liquid benzene and oxygen?

1

2

3

4

What is the degree of freedom of a system with 3 phases and 5 components?

3

4

5

6

Quiz/Test Summary
Title: Two-Phase Gas-Liquid Systems, Gibbs's Phase Rule and Vapour-Liquid Equilibria
Questions: 15
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