An old storage tank of “46” m3 stores steam at 6000 kPa and 330 °C. A crack develops at the
top wall of the tank and steam starts to leak out to the atmosphere. An engineer realizes the
problem on time and stops the leak when the pressure inside the tank is below 4000 kPa. If
the leak is assumed to be adiabatic and reversible,
a) What is the final temperature of the steam remained in the tank? (10 points)
b) How much steam is released to the atmosphere? (10 points)

A steam power plant operates on a practical Rankine Cycle. The steam enters the turbine at 3 MPa and “648” K and is condensed in the condenser at a pressure of 46 kPa. You are assigned on a project to improve the thermal efficiency of this plant. a) Draw the schematic of the plant and determine the thermal efficiency of the practical cycle assuming that the efficiencies of pump and turbine are 0.75 and 0.7, respectively. ( b) Draw a TS diagram and show your suggestions for improving the thermal efficiency (i.e. increasing/decreasing temperature of steam entering into turbine, increasing/decreasing pressure of the boiler or condenser, and any other option). Show the effect of each case you suggest on a TS diagram. Discuss also the quality of steam in each case.

Your boss has told you that you need to process a full 55 gallon drum of 1-butene that is stored at 15 atm and ambient temperature. You are going to combust this material with the stoichiometric amount of air at 1 atm and the product gasses will emerge at 579 oF with a conversion of 97%. You have a metal gas sphere that is 55 feet in diameter at ambient temperature that contains the air you are feeding in. You want to make sure you have enough air on hand. The 1-butene enters through a pipe that is ½ inch in diameter, while the air comes in through a 1 ½ in diameter pipe. The flue gases exit through a stack that is 6 inches in diameter. If you use another resource for physical properties, remember to cite it. Answer the following questions:

1) What does the pressure gauge on the tank need to read in order for you to make sure you have enough air, in psig?

Show your solution:

A theoretical colloidal system has its viscosity dependent on temperature like how the rate constant can be dependent with temperature. The following data were obtained for the viscosity of this colloid as a function of temperature.

T (Celsius): -45, -25, -10, 0, 20, 30

Viscosity (Pa-s): 7010, 263, 35, 12, 1.5, 0.7

Calculate the viscosity of this colloidal system (Pa-s) at 298 K.

choices are;

a) 0.90

b) 0.94

c) 0.96

d) 0.98

e) 1.00

how to write an introduction containing the oxidation of ethylene with oxygen using O2 and methodology ?

Manufacture of Acetylene. For the making of 6000 ft^3 of Acetylene (CHCH) gas at 70F and 750 mmHg. Solid calcium carbide (CaC2) which contains 97 wt% CaC2 and 3 wt% solid inerts is used along with water. The reaction is

The reaction A + 2B  C + D is taking place in a batch reactor. (Cao =1M, Cbo = 3M k=0.001 (1/M^2*min)). a) Assuming an elementary rate law, find the time necessary to reach the conversion of 0.9. You can assume constant volume batch reactor with well mixing. Also form the stoichiometric table. (15 points) b) Sometimes it is hard to obtain numerical solutions to the complex integrals. Find the answer using trapezoidal, Simpson 1/3 and Simpson 3/8, Five-point and n+1 point rules for numerical integration. Compare the results with answer t = 886.3min

Consider a solid spherical medium B with area P and density ρ. The sphere is subjected on both sides to different concentrations C, of species A to which it is permeable. The boundary surfaces at inner radius r1 to outer radius r2 are located within the solid adjacent to the interfaces, and the mole fractions of A at those surfaces are maintained at and respectively at all times. If DAB is the binary diffusivity of A through B, show through the basis that the molar fraction of species A through the sphere at can be expressed as; Ndiff,A, Sphere=4pier1r2CDab(Ya,1-Ya,2/r2-r1) and in terms of the concentration of A at the interfaces as: Ndiff,A,sphere=4pier1r2CDab(Ca,1-Ca,2/r2-r1) (b) Given inner and outer diameter of surfaces of B to be 4.68m and 4.80m respectively; moles per volume of A at the inner surface of B is 0.087 kmol/m3 and the same is negligible at the outer surface. Assuming there is no diffusion in medium B and the total molar concentration is constant, determine the mass flow rate of A by diffusion through medium B.

Calculate the standard enthalpy of reaction of the following:
a. C2H2(g) + O2(g)  2CO(g) + H2O(l)
b. NaOH(s) + HCl(g)  NaCl(s) + H2O(l)
c. H2SO4(l) + 2 NaOH(s)  Na2SO4(s) + H2O(l)

Pure ethanol is contained at the bottom of a long vertical tube( cross sectional area is 0.9 cm²). Above the liquid is a quaescent layer of air.The liquid at the bottom of the tube is carefully adpuruted so that the distance from the air liquid interface to the open top of the tube is constant at 15 cm . No liquid is withdrawn from the tube. At the open end of the tube is perpendicular to the vertical tube so that the concentration of ethanol at the top of the tube is eventially zero. The enture apparatus is kept at 0 degree celcius and P_int= 0.98 atm. The tube is carefully arranged so that there is no convection iin the tube. Over the course of several days we find that the average evaporation rate is 0.9190*10^-3 cm³/. What is the value of the diffusion coefficient of ethanol in air at 0 degree celcius? (mass density is 789 kg*m³ and its molar massis 46.079 g/mol )

A very large piece of carbon steel (? = 7854 kg/m3 , ? = 60.5 W/m·K, ?? = 434 J/kg·K) is initially at a temperature of 40°C. Suddenly, the flat surface of the steel is pressed into contact with an object at a temperature of 20°C. Which of the following is closest to the temperature of the steel at a location 10 mm from the flat surface after 0.5 s?

Which one of the following statements are TRUE or FALSE:

1.1. The bond strength of both reactants and products affect the reaction rate [ 1]

1.2. In most cases where reactions occur in a solution, the more the concentration of reactants decreases, the more the reaction rate increases. [1 ]

1.3. In general, in irreversible gas phase reactions, the total pressure of the mixture affects the reaction rate more than the partial pressures of the reactants. [1 ]

1.4. If the forward reaction is endothermic, the reverse reaction is exothermic. [1 ]

1.5. The reaction rate of endothermic reaction is faster at high temperatures while the rate of exothermic reactions is slower at high temperatures and vice versa [ 1]

1.6. The larger the activation energy, the more sensitive is the rate of reaction to temperature. [1 ]

1.7. The rate of combustion of bigger particles of coal is faster because they contain more energy than smaller particles of coal. [ 1]

1.8. During a catalytic reaction, the catalyst can react but it is not consumed [1 ]

1.9. The reaction rate constant k is not truly constant but it is independent of the concentration of the reactants. [1 ]

1.10. A catalyst lowers the activation energy of reactants so that the reaction rate is relatively high at lower temperatures than the reaction rates without the catalyst.

[1 ]