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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.
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
