1) The diffusion coefficient of the protein BSA in water at 25°C is 6.7 10^-11 m²s^-1. Calculate the hydrodynamic volume of this protein assuming it can be regarded as a sphere

Vh =

2) The molecular weight of BSA is 66,430 g/mol, and its partial specific volume (the inverse of the density) is 0.734 cm³/g. What is the volume of one “dry” molecule of BSA? (i.e. the unhydrated protein)

V =

A water sample obtained from the neigborhood pond was analyzed for dissolved oxygen content. A volume of 300 mL, with temperature 21 degrees Celsius, was analyzed using the Wrinkler method shown in the simulated lab material. It took 15.0 mL of 0.01 mol/L Na2S2O3 solution to reach titration end point.

*Note: Na2S2O3 solution is the source of S2O32- ions for the titration reaction.

In the succeeding questions, provide the following values required. Take note of the units

a.What is the mass of the water sample?

b. milimoles of S2O32- reacted (1 mole = 1000 milimoles)

c. milimoles of Mn(OH)3

d. milimoles of dissolved oxygen

e. mg of dissolved oxygen, O2

f. ppm dissolved oxygen (mg O2 / kg water)

g. Is the water in the pond good enough for aquatic life? Why or why not?

h. Based on DO content, do you consider the water in the pond polluted?

What are the difficulties involved in stopping counterfeiting of drugs? Give brief descriptions of various current measures that are being used/proposed by manufactures to resolve these.

3. If a diffuser does no net work and has no net heat transfer, it is ineffective.

a. true

b. false

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4. In a heat exchanger, the means of heat transfer is/are _____

a. Conduction

b. Convection

c. Radiation

d. A and B

e. B and C

f. A and C

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5. Conservation of mass applies to steady systems, but not to unsteady systems.

a. TRUE

b. FALSE

c. There is not enough information to give a definitive answer

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Some theoretical questions in Thermodynamics require your clarification and explanations.

Are the molar extinction coefficient and cross-section of an absorption related to the probability of absorption?

I have struggled to find a formal definition of cross-section of absorption; from what I've gathered, its best defined as 'the intensity of absorption'.

Wikipedia's formal definition of the molar extinction coefficient is 'how strongly a species absorbs EMR at a given wavelength, per molar concentration'.

So how are the molar extinction coefficient and cross-section different? I presume that whilst the molar extinction coefficient remains constant for a given wavelength across all concentrations, the cross-section differs for a given wavelength with changing concentration.

Is either the molar extinction coefficient or cross-section of an absorption equal to the probability that a single species absorbs a photon at any one point in time?

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 71°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 730.0 mm of Hg, what would be the new gauge pressure in the cylinder? mm Hg

What is a life cycle analysis diagram of a reusable and insulated water bottle?

Air at 90.0°C and 1.0 atm (absolute) contains 7.0 mole% water. A continuous stream of this air enters a compressor–condenser, in which the temperature is lowered to 18.6°C and the pressure is raised to 2.90 atm. The air leaving the condenser is then heated isobarically to 90.0°C. Calculate the fraction of water that is condensed from the air, the relative humidity of the outlet air at 90.0°C, and the ratio (m3 outlet air at 90.0°C)/(m3 feed air) at 90.0°C.

Find

Fraction of water condensed

Relative humidity of the outlet air

Volume ratio of outlet to inlet air:

Part of Dr. Ritchey’s work in her previous job involved boiling and condensing hydrocarbon mixtures. In one of her experiments, she used a binary mixture of n-pentane (density 39.1 lbm/ft^3) and p-xylene (density 53.8 lbm/ft^3). One outlet stream of her condenser was measured to have a flow rate of 32 ft^3/min and a concentration of 30/70 n-pentane/p-xylene by volume. The other outlet stream was measured to have a flow rate of 24 ft^3/min and a concentration of 50/50 n-pentane/p-xylene by volume. If the system operates at steady state and the only inlet to her condenser has a flow rate of 56 ft^3/min, what is the inlet concentration of n-pentane in % by volume?

Your answer should be between 0 and 100. Round your answer to 1 decimal place for entry into eCampus. Do not enter units. Example: 12.3

Note: 30/70 by volume means that 30% of the volume is n-pentane and 70% of the volume is p-xylene.

1. Calculate the theoretical flame temperature for CO gas burned at constant pressure with 100% excess air, when the reactants enter at 100°C.

Please show work, do not copy the solution founded. show your solution! if you can not answer this question, then do not attempt to copy others' work.  

Question 1: Liquid (A) flows down as a thin film over the outside surface of a vertical flat plate 1.5 m wide (W = 1.5 m) and 3.5 m long (L = 3.5). Inert gas (B) flows across (perpendicular to) the width of the flat plate at a speed of 5 m/s. The supply of (A) is 0.27 mol/s at one end of the plate and the flow is considered to be turbulent. The gas composition of (A) at the edge of the film is 14% and in the bulk 0%. (B) can be assumed non-diffusing (NB = 0). The system is not dilute.

Viscosity of liquid (A), µA = 0.0000161 Pa×s = 1.61x10-5 Pa×s

Diffusion coefficient of A through B, DAB = 1x10-5 m2 /s

Density of A, rA = 1.2 kg/m3

Total concentration, c = 44 mol/m3

How many meters of the plate will be dry from (A)? ‘show your working out’

Q2) Show calculations for the creation of the following solutions from solid and 18.1 M H₂SO₄ stock solution.

a)   25.00 mL of 0.1000 M potassium iodide solution in 0.2000 M H₂SO₄

b)   25.00 mL of 0.1000 M potassium permanganate in 0.1500 M H₂SO₄

c)  To solution “a”, 3 % hydrogen peroxide is added.  In a reddish solution appears.  The reddish color is due to the formation of I_2.   Write the balanced REDOX equation.  Make sure you explain the addition of sulfuric acid.  Is hydrogen peroxide an oxidation or reducing agent?

d) To solution “b”, 3 % hydrogen peroxide is added.  The purple solution becomes clear (formation of Mn²⁺)_.   Write the balanced REDOX equation.  Make sure you explain the addition of sulfuric acid.  Is hydrogen peroxide an oxidation or reducing agent?

A petroleum refinery can handle the processing of two grades of
crude oils, #1 and #2, to produce four kinds of products gasoline, kerosene, fuel oil and
residual.
The total costs include raw material costs and processing costs. The raw material costs for the
crude oils are $24/bbl for #1, and $15/bbl for #2. The processing costs are $0.5/bbl for #1, and
$1.0/bbl for #2.
The sales prices of the products are $36/bbl for gasoline, $24/bbl for kerosene, $21/bbl for fuel
oil and $10/bbl for residual.
The following is the information for the product yield (volume percent of raw material) and
maximum allowable production of each product (bbl/day):
One bbl crude oil #1 can produce 0.80 bbl gasoline, 0.05 bbl kerosene, 0.10 bbl fuel oil, and
0.05 bbl residual. One bbl crude oil #2 can produce 0.44 bbl gasoline, 0.10 bbl kerosene, 0.36
bbl fuel oil, and 0.10 bbl residual. The maximum allowable production for gasoline is 24,000
bbl/day, for kerosene is 2,000 bbl/day, and for fuel oil is 6,000 bbl/day, and no maximum
allowable production limitation for residual.
(1) Based on the data above, derive a mathematical formulation for this linear programming
problem and determine: The optimum feed schedule (bbl/day) of the two crude oils for the
maximum profit, using method of simultaneous equations. How much is the maximum profit
($/day)?
(2) Comment on how variation of raw material costs and sales prices will affect the feed
schedule and profitability on this kind of project in industry.

Fresh orange juice contains 12.0 wt% solids and the balance water is fed to an evaporator for
concentration process. The juice that enters the evaporator is concentrated to 58 wt%
solids. However, the volatile constituent of the juice somehow can escape with the water,
leaving the concentrate with a flat taste. It is suggested for the stream of fresh orange juice
to by-pass the evaporator at certain fraction and mixed with the evaporator product stream to
achieve the desired final concentration, which is 42.0 wt% solids.Calculate the amount of product produced and the fraction of the feed that by-pass the
evaporator. State clearly your assumption and basis of calculation.
Propose another possible way to preserve the volatile ingredients that provide the taste of the
concentrate and thereby obtain an even better tasting product. List down the advantages
and the drawbacks of your suggestion.