Chemical Engineering

Partial Saturation Terminology

Question 1
Marks : +2 | -2
Pass Ratio : 100%
What is the relative saturation of a gas with partial pressure 38 mm Hg and vapor pressure 1 torr?
0.05
0.5
2
38
Explanation:
1 torr = 1 mm Hg, => relative saturation = 38/1 = 38.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
What is the molal humidity of a gas with partial pressure with vapor 1 mm Hg and partial pressure without vapor 1 atm?
90%
131%
214%
288%
Explanation:
Molal humidity = 133.3/101.3*100 = 131%.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
What is the molal saturation of a gas with 10 Pa partial pressure without vapor and 0.5 atm partial pressure with vapor?
0.5
1
5
101.3
Explanation:
Molal saturation = 0.5*101.3/10 = 5.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
What is called the ratio of partial pressure of vapor and partial pressure of the dry gas?
Humidity
Relative humidity
Molal humidity
None of the mentioned
Explanation:
Partial pressure of vapor divided by the partial pressure of vapor free gas is called molal humidity.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
What is the relative saturation of a gas with partial pressure 10 mm Hg and vapor pressure 5 mm Hg?
0.5
1
2
4
Explanation:
Relative saturation = 10/5 = 2.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
What is the molal humidity of a gas with pressure of gas vapor 10 mm Hg and pressure of vapor free gas 20 mm Hg?
25%
50%
100%
200%
Explanation:
Molal humidity = 10/20*100 = 50%.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
What is the relative humidity of a gas with a partial pressure of water vapor is 5 mm Hg and vapor pressure 8 mm Hg?
25%
32.5%
45%
62.5%
Explanation:
Relative humidity = 5/8*100 = 62.5%.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
What is the molal saturation of a gas with 10 moles of gas vapor and 25 moles of dry gas?
0.2
0.4
0.8
1
Explanation:
Molal saturation = 10/25 = 0.4.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is defined as the ratio of partial pressure and vapor pressure?
Relative Humidity
Molal Humidity
Humidity
None of the mentioned
Explanation:
Partial pressure divided by vapor pressure is called relative humidity.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
What is the relative humidity of a gas with a partial pressure of water vapor 360 Pa and vapor pressure 1 atm?
100%
225.1%
355.4%
405.9%
Explanation:
Relative humidity = 360/101.3*100 = 355.4%.