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Chemical Engineering Practice Test: Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria
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Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria topics include: Partial saturation terminology, partial saturation material balance problems, gibbs phase rule and vapor liquid equilibria in binary systems. A two-phase mixture of gas and liquid is univariant, meaning it has a specific vapor pressure at a given temperature. If the pressure is reduced by increasing the volume, the material will move from the liquid to the vapor phase to maintain the pressure. The phase rule states that F = C − P + 2, where F is the degrees of freedom, C is the number of components,... Show more
Chemical Engineering Practice Test: Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria
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25 Questions

1. What is the degree of freedom of a system with 3 phases and 5 components?
2. Which of the following is equal to the product of humidity and mass of dry gas?
3. What is the degree of freedom of a gas mixture composed of O2, H2O and H2O2?
4. What is the partial pressure of a 70% gas in a system, if H = 5 mm Hg?
5. What is called the ratio of partial pressure of vapor and partial pressure of the dry gas?
6. A reaction has produced 45 moles of water and 25 liter of bone dry air at 27oC and 25 atm, what is the humidity?
7. 10 mole glucose reacts completely with excess air, if 25 liter of bone dry air is produced at 27oC and 30 atm, what is the humidity?
8. What is the relative saturation of a gas with partial pressure 10 mm Hg and vapor pressure 5 mm Hg?
9. 1 mole of CH4 reacts completely with excess air, if 5 liter of bone dry air is produced at 27oC and 5 atm, what is the humidity?
10. What is the degrees of freedom of a system with a mixture of copper pyrites, liquid benzene and helium?
11. What is the degree of freedom of a gas mixture composed of CO2, SO2, SO3, CH4, H2CO3?
12. What is the degrees of freedom of a system with pure water?
13. What is the partial pressure of a 10% gas in a system, if H = 2 mm Hg?
14. What is the degrees of freedom of a system with a mixture of water and ice?
15. What is the mass of water vapor, if the mass of dry gas is 10 lb and humidity 10%?
16. 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?
17. What is the partial pressure of 20% gas in a system with vapor pressure 10 mm Hg?
18. What is the molal saturation of a gas with 10 moles of gas vapor and 25 moles of dry gas?
19. What is the degree of freedom of a mixture composed of liquid O2, gaseous H2 and ice?
20. What is the relative humidity of a gas with a partial pressure of water vapor 360 Pa and vapor pressure 1 atm?
21. 25 mole of CH4 reacts completely with excess air, if 25 liter of bone dry air is produced at 27oC and 5 atm, what is the humidity?
22. 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?
23. What is the humidity, if the mass of dry gas is 10 Kg and mass of water vapor is 5 Kg?
24. What is the molal saturation of a gas with 10 Pa partial pressure without vapor and 0.5 atm partial pressure with vapor?
25. What is the vapor pressure of 50% gas in a system with partial pressure 2 mm Hg?