Basic Chemical Engineering Practice Test 6

1. A liquid evaporates first at which of the following conditions?

2. What is the fraction of a gas in a system at partial pressure 1 atm, if the 0.2 fraction of the same gas is at partial pressure 4 atm and 0.4 fraction at partial pressure 8 atm (Use Freundlich Isotherm)?

3. 1 mole glucose reacts completely with excess air, if 25 liter of bone dry air is produced at 27^oC and 5 atm, what is the humidity?

4. The vapor pressure of a compound in a liquid phase is given by ln p* = 21 – 2800/T, and in solid phase it is given by ln p* = 28 – 3500/T, what is the sublimation temperature of the compound?

5. What is the partial pressure of a 70% gas in a system, if H = 5 mm Hg?

6. At which of the following values of pressure a solid melts first?

7. Which of the following is not a way of condensation of vapor?

8. A process is carried out for the feed mixture of 90% air and 10% water vapor, the compressor recovered 90% of water, what is the exit pressure of the compressor if the partial pressure of water vapor is 50 mm Hg?

9. What is the degrees of freedom of a system with a mixture of water and ice?

10. What is the fraction of a gas in a system at partial pressure 2 mm Hg, if the 0.2 fraction of the same gas is at partial pressure 8 mm Hg and 0.3 fraction at partial pressure 18 mm Hg (Use Freundlich Isotherm)?