A waste gas stream

containing 5.5% ammonia in air is being stripped of the bulk of the ammonia by absorbing it in water in a tray tower. The liquid to gas ratio on a molal basis is known to be 2.5. Both the inlet gas and inlet water streams enter at 25oC. The inlet and outlet gas streams may be assumed to be saturated with water vapour. During operation a thermocouple in the outlet liquid stream measures a temperature of 35.2oC.

a)Calculate the mole fraction of ammonia on the outlet gas stream and hence the percentage recovery of ammonia in the column

b)Determine the number of ideal stages required for this separation

Data:Heat of Solution= 37000kJkmolNH3-1

Specific Heat of Water= 75kJkmol-1oC-1

Equilibria: In the equation y=mx,

25oC m=0.97

30oCm=1.22

35oCm=1.53

A gas mixture containing 80.0 mole% N₂ and the balance n-hexane flows through a pipe at a rate of 100.0 m³/h. The pressure is 2.00 atm absolute and the temperature is 140.0°C.

a. What is the molar flow rate of the gas?  

b. To what temperature would the gas have to be cooled at constant pressure in order to begin condensing hexane?

c. To what temperature would the gas have to be cooled at constant pressure in order to condense 85.0% of the hexane?

A gas mixture contains 20.0 mole% H₂O(v) and 80.0 mole% N₂.

The gas temperature and absolute pressure at the start of each of the three parts of this problem are 66°C and 700.0 mm Hg.

Ideal gas behavior may be assumed in every part of this problem.

a. If some of the gas mixture is put in a cylinder and slowly cooled at constant pressure, at what temperature would the first drop of liquid form? °C

b. If a 30.0 liter flask is filled with some of the gas mixture and sealed, and 30.0% of the water vapor in the flask is condensed, what volume would be occupied by the liquid water?  cm³

What would be the system temperature? °C

c. If the gas mixture is stored in a rigid-walled cylinder and a low-pressure weather front moves in and the barometric (atmosopheric) pressure drops from 760 mm Hg to 720.0 mm of Hg, what would be the new gauge pressure in the cylinder?  mm Hg

Please work out and explain. Thanks.

A stream of gas mixture of Acetone and Nitrogen is at Pgauge = 8 atm. If the partial pressure of acetone is pA= 500 mmHg, and the barometer reads Patm = 760mmHg, what is

a) the total pressure of this gas stream [mmHg-abs] and partial pressure of nitrogen

b) the mole fraction of acetone in the gas stream

c) If the volume flow rate of this gas stream is 1m^3/min, what is the component volume flow rate of acetone?

Describe the microstructure resulting from precipitation hardening and what the structure looks like on a phase diagram

1) How i measure the chromatography step by step?

2) How i measure the Spectrscopy step by step?

The synthesis reaction is highly exothermic; therefore, cooling water must be pumped through the jacket of the reactor to maintain a stable temperature. Find the enthalpies of the main reaction and side reaction. (Use Hess’ law if necessary.) Based on the heats of reaction, calculate the necessary rate of cooling, and the rate of cooling water flow required. (Cooling water is available at 5oC, with max ΔT = 15oC)

Main: C3H6 + 1.5O2 --> CO2 + H2O

side: C3H6 + 4.5O2 --> 3CO2 + 3H2O

Based on the data from the previous question, select an appropriate pipe size from the NPS schedule for your cooling water flow. Fluid velocity should be at least 1.5m/s to prevent the fouling of the pipes.

Gaseous octane (C8H18) at 25 C, 1 atm enters a combustion chamber operating at steady state and burns adiabatically with the stoichiometric amount of air entering at the same conditions. The combustion products consisting of CO2, CO, H2O(g), H2, O2, and N2 exit the combustion chamber at 2600 K and 1 atm.

Determine the composition of the products. Draw a schematic of the problem and label with known information and list all appropriate assumptions.

Hint: You have to solve two algebraic equations. To obtain the two solutions, one of the methods is the iterative method.

A tank initially holds 140 L of salt water with density of 1.05g/cm3. Over a 30-minute period, both hot and cold water enter (Q[hot]: Q[cold]= 3:1) the tank while mixed warm water is drained from one outlet. The discharge rate at the outlet is 25L/min and the volume of the water left in the tank at the end of 30 minutes is 40 L. What is the mass flow rate of cold water entering.

For a first order process G(s)= 4/(s+0.5):

(a) Qualitatively sketch the pattern of the Bode diagram for this process, and indicate the limiting behaviors( i.e., the slopes and values as s --> 0 and s --> infinity) of ARn( the normalized amplitude ratio) and Phi ( the phase shift) in the plots.

(b) Will a P-only control possibly make the process unstable? Show your reasoning based on the Bode stability criterion.

(c) What if a delay term e^-5s is included, i.e., G(s) = - 4e^-5s/(s+0.5, will a P-only control possibly make the process unstable (you don't need to determine the exact value of the ultimate controller gain Kcu)? Show your reasoning based on the Bode stability criterion.

Urea was hydrolyzed with an enzyme at a fixed concentration of 50 μM and the following data were obtained. Using Lineweaver-Burk plot determine the kinetic parameters.