You are watching TV late at night and see an ad for the ACME Model #163 refrigeration and heating unit for only $99.99. The unit takes compressed air at 1.25 atm pressure and 75°F and produces two streams at atmospheric pressure, a refrigeration stream at -15°F and one at 90°F with no work or energy put into the system! Is this possible? [yes] Why or why not? [mass and energy balance work ] Prove your answer. Assume air is an ideal gas

Air Date: Tc = 238.5 R Pc = 37.2 atm Cp = 7 Btu/lbmole°F Sp. Gr. = 1.0

Answers are in brackets but I want to know why because I am a diligent student. lol.

Does isoctane/n octane mixture follow roults law?

Why do the Au NPs grow in the subsequent steps rather than just form more particles of the same initial size? ?

How does the gold colloid detect electrolytes such as NaCl? Explain what happens when NaCl is added to the solution?

How to convert wave function to matrix in H2 and LiH . And how to find the determinant(energy)?

1- How to find the Shear rate and stress

2- How to find visosity, and how to calculate visosity vs shear rate.

3- point of log log polt of vis

4- power law indices k,n ? and range of n?

2. Understand how much work and heat are transferred in an ideal heat engine or reverse heat engine.

a) What is the maximum work that I can get from a heat source at 450K and a cold sink at 298K? (0.338 J per joule of heat in at 450 K)

b) How much heat can I get from ideal reverse heat engine per Joule of energy of work if the outside temperature is 10oC and my house is at 25oC? (approx. 20 J)

In relation to LED technology

1) outline the problem the technology solves?

2) WHAT DOES THE TECHNOLOGY DO?

3) Identify the major material property requiremens ( strong, conductive, corrosion resistant, etc) and design constraints (eg. must be molded, must function within a temperature range, etc)

Methane at 25°C is burned in a boiler furnace with 10.0% excess air. The air enters the burner at a temperature of 100°C. Ninety percent of the methane fed is consumed; the product gas is analyzed and found to contain 10.0 mol CO2 per 1 mol of CO. The exhaust gases exit the furnace at 400°C. Calculate the rate of heat transferred from the furnace, given that a molar flow rate of 100 mol/s CH4 is fed to the furnace.

Must be done with the Program Raptor

Program #2 - Area of Shapes

Design a superclass called Shape that contains two functions—getVolume() and getInput(). The getVolume and getInput functions in the Shape class will simply return 0, you will derive from them in your subclasses mentioned below. Define 3 subclasses of the Shape class—Sphere, Cube, and Cone. The sphere class will need a radius field, the cube class will need a length field, and the cone class will need radius and height fields. Declare all of the appropriate setters and getters for each of these classes. The sphere class will calculate it’s volume as 4/3 * PI * r * r * r. The cube’s volume is length * length * length. The cone’s volume is PI * radius * radius * height/3. Override the getInput method for each subclass so it will prompt the user to input the dimensions for each shape. Then, override the getVolume method in each subclass so it will calculate and return the volume of the shape.

Demonstrate your classes be writing a menu driven program that allows the user to select which shape they want to create. After making their selection, the program will call getInput on the object to ask the user to input the appropriate dimensions for that shape. The program should then display the volume for that shape. The menu will continue to display until the user chooses to quit.

Example Output:
Please select an option:
1) Volume of a sphere
2) Volume of a cube
3) Volume of a cone
4) Quit
Enter your selection:
2 [Enter]
Enter the cube length:
10 [Enter]
The Volume for your cube is 1000

Please select an option:
1) Volume of a circle
2) Volume of a rectangle
3) Volume of a triangle
4) Quit
Enter your selection:
4 [Enter]
Thanks for playing!

The reaction of nitric oxide, NO, with hydrogen, H₂, produces nitrogen, N₂, and water, H₂O, according to the equation

2 NO + 2 H₂ ? N₂ + 2 H₂O

A student obtained the following data:

(a) Determine the most probable rate equation for the reaction, with v for the reaction rate and k for the rate coefficient.

(b) Evaluate the numerical value (with units) of the rate coefficient.

(c) Choose the appropriate matches below. Note that some of the units have to be expressed in a particular way in the drop down menus, e.g. L⁴ shows as L4, s^-1 looks like s-1, L⁴ s^-1 looks like L4 s-1.

Background reading:

the Chemguide concentration dependence page (38kB)

the Chem guide orders and mechanism page (28kB)

Energy section Powerpoint lecture notes

Reagent A undergoes an essentially irreversible isomerization reaction that obeys first-order kinetics. A --> B Both A and B are liquids at room temperature and both have extremely high boiling points. Pure A at 20^oC is fed into the reactor.

Data:

Reaction rate expression: r = k.C_A

Rate constant at 163 °C = 0.8 hr^-1

Activation energy = 30,000 cal/gmole

Heat of reaction = — 83 cal/g

Molecular weight = 250

C_pA=C_pB=0.5 cal/g.^oC p_A=p_B= 0.9 g/cm3

a) Determine the CSTR volume and heat transfer rate necessary to produce 150 kg/h of B with 60% conversion of A if the reactor is operated at 160^oC.

b) Calculate the CSTR volume and temperature to achieve the same conversion if the reactor is operated adiabatically

Methane is completely burned with 30% excess air, with 20% of the carbon transforming to CO.
a) What is the molar composition of the stack gas on a dry basis?
b) Estimate the partial pressure of the CO in the stack gas if the barometer read 750 mmHg.

The elementary irreversible gas phase reaction A --> B + C is carried out in a PFR packed with catalyst. Pure A enters the reactor at a volumetric flowrate of 20 dm³ /s at a pressure of 10 atm and 450K. Consider that the heat is removed by a heat exchanger jacketing the reactor. The flowrate of coolant through the jacket is sufficiently high so that the ambient exchanger temperature is constant at 50^oC.

C_pA=40 J/mol.K HfA=-70 kJ/mol

C_pB=25 J/mol.K H_fB=-50 kJ/mol   (T_R=273 K)

C_pC=15 J/mol.K H_fC=-40 kJ/mol

k = 0.133 exp (E/R [ 1/450 ? 1/T ]) dm³ kg cat. s with E = 31.4 kJ/mol

U= 100 W/m2 .K

D_t=10 cm

p_b=5 g/cm3

a) Plot the conversion and temperature down the plug flow reactor until 80% conversion is achieved. Discuss the effect of feed temperature on the temperature profile and conversion.

b) Calculate the amount of catalyst required to achieve 80% conversion

Please do not copy the previous solutions. This question is different

The reaction between ammonia and formaldehyde to produce hexamine is

4NH3 + 6 HCHO ->(CH2)6N4 + 6 H2O

A 0.5 liter CSTR is used for the reaction. Each reactant is fed to the reactor in a separate stream, at the rate of 1.5x10-3 liter/s each. The ammonia concentration is 4.0 mol/liter and the formaldehyde concentration is 6.4 mol/liter. The reactor temperature is 36C. Calculate the concentration of ammonia and formaldehyde in the effluent stream. In kinetics below A is ammonia and B is formaldehyde.

(-rA) = kCACB^2 mole A/liter-s where k = 1,420 exp (-3090/T)