The chromatographic separation happens in a specific way. Answer the following questions about the procedure:

We fill the column approximately 2/3 of the way. What would be the consequence of only barely filling the column with alumina?

We gradually add petroleum ether to the column, always making sure to have the petroleum ether level adjust to right above the alumina level, before adding more. Why is this necessary?

What would be the specific consequence of eluting the column with diethyl ether first, and then petroleum ether second?

A typical H2–O2 PEMFC might operate at a voltage of 0.75 V and λ = 1.10. At STP, what is the efficiency of such a fuel cell (use HHV and assume pure oxygen at the cathode)?

Write the balanced reaction equation for the complete combustion of butane, C₄H₁₀, in air. Determine the mass and mole fractions of fuel, oxygen and nitrogen in the reactants. Also, determine the mass and mole fraction of carbon dioxide in the products. Determine the mass and mole air-fuel ratios.

Question 1: Consider the following reaction:

SO2Cl2(g)⇌SO2(g)+Cl2(g)
Kc=2.99×10−7 at 227 ∘C

If a reaction mixture initially contains 0.195 MSO2Cl2, what is the equilibrium concentration of Cl2at 227 ∘C??

Question 2:

Consider the reaction

CO(g)+H2O(g)⇌CO2(g)+H2(g)
Kc=102 at 500 K

A reaction mixture initially contains 0.130 MCOand 0.130 MH2O.

What will be the equilibrium concentration of H2O?

Question 3:

The following reaction was performed in a sealed vessel at 768 ∘C :

H2(g)+I2(g)⇌2HI(g)

Initially, only H2 and I2 were present at concentrations of [H2]=3.65M and [I2]=2.70M. The equilibrium concentration of I2 is 0.0800 M . What is the equilibrium constant, Kc, for the reaction at this temperature?

Please explain and answer all! Thank you

Note that 1 calorie (4.2 J) is the energy needed to raise 1 gram of water 1 degree, and recall that a food calorie is actually a kilocalorie
Use whatever approximations you need, but state what they are.  

Show your work.

1) How much ice water must you drink and so heat up to equal the energy in a chocolate glazed donut?

2) Will drinking ice water work as a weight loss strategy?

3) How about standing on a windy mountaintop soaking wet?

4) How far must you job to burn off the calories in that donut?

Suppose you’re building a vacation cottage up in the Rocky Mountains and you are concerned about the depth at which a new water line should be buried to avoid freezing during the cold winter weather. The soil there is dry and homogenous with a thermal diffusivity of 0.02 ft2/hr and a thermal conductivity of0.48 Btu/ ft hr °F . Suppose the initial temperature is 45 °F everywhere. At t=0, a very strong cold front moves in and the ambient temperature drops to –15 °F, and remains there for 48 hrs. How deep should the water line be so that the soil around the pipe does not fall below 30 °F during this period? Also, what is the heat flux at that depth at t=48 hrs?

Separation Process:

Consider the in-class demonstration problem involving the MeOH/water separation. Suppose that a saturated steam feed was injected into the bottom of column (it is sparged to get good contact with the liquid that is falling down from the tray above its entrance). Take the specifications for the feed to be identical as in the McCabe-Thiele demonstration done in class

(zF = 0.36, F = 216.8 kmol/h). Further, the compositions of the distillate and the bottoms

should be the same as in the demonstration: mole fraction of MeOH is xD = 0.915 and xW = 0.00565. The saturated steam feed is entering at 200 kmol/h.

2.

What are the internal vapour and liquid flow rates now? Are the distillate or bottoms flow rates significantly different compared to the previous case?

What is the actual reflux ratio under these conditions?

What is the equation of the lower operating line now?

Further, determine the number of ideal stages and compare to the demonstration in class. Describe any advantages or disadvantages of using steam injection compared to the previous case

During the very first step of titration of an unknown acid, is it important how much distilled water we add?(after pipetting 10 ml of the unknown acid)

Does it have to be just enough to soak the pH electrode or it is important and we have to be precise with it as it defines the molarity?

THE QUESTION IS ABOUT ACID-BASE TITRATION.

Please answer legibly. Please EXPLAIN your answer. (yes and no is not enough). THANK YOU FOR YOUR HELP.

A steam turbine receives steam from two boilers.

One flow is 5 kg/s at 3 MPa, 700°C and the other flow is 15 kg/s at 800 kPa, 500°C.

The exit state is 10 kPa, with a quality of 96%.

Calculate the efficiency of the turbine and the total power output.

At what rate must heat be supplied to 15.0 kg/s of air, if the temperature is increased from 61.0°C to 650°C?

a) Calculate the rate that heat must be supplied by integrating the heat capacity formula for air.

b) Calculate the rate that heat must be supplied using the specific enthalpy table of gases located in your text by following the steps below. What is the specific enthalpy of air at 61.0°C, if the reference state is pref = 1 atm, and Tref = 25°C? Use the specific enthalpy table of gases in your text for this calculation.

c) What is the specific enthalpy of air at 650°C, if the reference state is pref = 1 atm, and Tref = 25°C. Use the specific enthalpy table of gases in your text for this calculation.

d) Calculate the rate that heat must be supplied to 15.0 kg/s or air.

Any values not given need to be looked up.

A 56.0%/44.0% by volume propane/n-butane mixture is cooled from 375°C to 105°C. FInd the change in ethalpy of this mixture by following the steps below. Assume ideal behavior. a) a) What is the average molar mass of the mixture?

b) What is the change in specific enthalpy of pure propane from 375°C to 105°C?

c) What is the change in specific enthalpy of pure n-butane from 375°C to 105°C?

d) What is the change in specific enthalpy of the mixture from 375°C to 105°C?

e) What is the change in enthalpy of the mixture from 375°C to 105°C in kJ/kg?

Using a value of CA0= 6 mol/liter, prepare a plot of conversion Vs. ktau, for a first-order reaction and a second-order reactionconducted in a CSTR

First, derive an expression for X = f(ktau)and then make the graph.

The graph should cover a range from 0 to 0.95 for X and from 0 to 35 for
ktau. Find the k^tau value, at which the conversion becomes higher for the
first-order reaction than for the second-order reaction.
(b) Explain in your own words why, for a given k tau, a higher conversion is
reached for the second-order reaction at low conversions, while the
opposite is true at high conversions.

An insulated heat exchanger uses geothermal water to heat water for a chemical plant. Water enters the heat exchanger at a rate of 36 kg/s and is heated from 23 ∘∘C to 69 ∘∘C. The geothermal water enters the exchanger at a rate of 41.4 kg/s and at an initial temperature of 130 ∘∘C. The specific heat of the geothermal water is 4.31 kJ/(kg K). Determine the rate of heat transfer between the two streams and the rate of entropy generation for the heat exchange process. (Assume constant specific heats and that neither stream undergoes a phase change during the process.)

rate of heat transfer _____ kW

rate of entropy generation ______ kW/K

answer to part a is 6922.08 kW

The volume of a microbial culture increases according to the formula:

V (cm^3) = 5 - 0.2 t e^t

Where t is the time in seconds. It is requested:

a. The units of the constants 5 and 0.2

b. Calculate the expression for V (in^3) in terms of t (h).

c. The exponential function and its argument must be non-dimensional. In appearance, the given function contradicts two rules and, however, is valid. Explain the paradox.

What are the essential and desirable requirements of materials and property that might be considered to design sport helmet for riding bicycle?