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Chemical Engineering Questions and Answers February 04, 2018

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Show that for an isothermal compressible flow, P1DtDP=V (Hint: use the ideal gas law relation)
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A stream of ethane, n-butane, n-hexane, and n-heptane is to be separated using a flash drum operating at 250 kPa and 60C. The feed (100 kmol/h) is 15 % ethane, 20 % n-butane, 35 % nhexane, and 30 % n-heptane by mole. Calculate the composition and flow rates of the liquid and vapor products. Show calculations by hand for two trials and the result

why does the values mainly pressure of van der waals and Soave Redlich Kwong Equation give somewhat the same answers?

The gas-phase reaction 1/2 N2 + 3/2 H2 NH3 is to be carried out isothermally in a constant volume batch reactor. The molar feed is 50% H2 and 50% N2, at a pressure of 17.4 atm and at a temperature of 227 oC. Suppose an elementary reaction with kN2 = 40 dm3/(mol.s). Calculate the rate of reaction for 55% conversion. (20 pts) Answer

An gas mixture containing carbon dioxide (1) and propane (2) is in equilibrium with a liquid at 300 K and 17 atm. The activity coefficient for carbon dioxide in the liquid is described by In i RT (1) where A = 435 cal/(mol K). Find the liquid phase mole fraction of carbon dioxide. The pure-component vapor pressures at 300 K are 71.5 atm for carbon

1. Calculate the free energy of mixing once the walls that separate the gases are removed if the process is carried out at 300K, assume that the gases are ideal (2 points)
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one million DNA molecules are being sorted and are being placed into 1000 collection reservoirs. at the end of the process there will be 1000 molecules in each reservoir. how many ways can this be done if the order of placement of each molecule into a reservoir is unimportant? Using Stirling's approximation twice.

small amount of water, which is soluble in cyclohexane, was present in the determination of the freezing point of cyclohexane but not in the determination of the freezing point of cyclohexane containing the solute. How would this affect the results obtained for the molar mass of the solute (i.e., smaller or larger

1872 g of 1-propanol (60 g/mol) was mixed with an unknown amount of 1-butanol (74 g/ mol) at 760 mmHg. When the above mixture is heated to 106.5C, the number of moles in the liquid state is twice the number of moles in the gas phase, a) calculate the global composition of the mixture; b) calculate the mass of 1-butanol present in the system; c)

How to calculate the concentration (C mg quinine/L)? Mass m = 121,90 Molar Mass of quinine sulfate dihydrate = 782,95 g/mol The answer is to be in : mg quinine/L

On the basis of oxidation number considerations, one of the oxides given below would not react with molecular oxygen. Which one is it? N2O P4O6 NO SO3 SO2
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2. Show that the Planck's expression for blackbody radiation in the limit of h0 returns to the expression from the classical theory
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3. Highlight the results of the photoelectric effect and discuss how a simple relation can explain all the results
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3.28 Determine the manometer reading, h, for the flow shown in Fig. P3.28
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can someone explain , that why people using calcium hydroxide as carbon capture to decrease carbon, but in the process of making calcium hydrocide will produce carbon, so is that mean iy just the same? give me reason

Which of the following diagrams best represents the hydration of NaBr when dissolved in water? The Brion is larger in size than the Na+ion
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a)Could sulfate reducing bacteria (SRB) grow in the absence of sulfate? b)Since lactate is known to be a preferred substrate by some SRB, use thermodynamic principles. to explore whether the following reaction could occur in an anaerobic digester environment: CH3CHOHCOO- + H2O CH3COO- + CO2 + 2H2 If needed, you can assume lactate and acetate

Question 1 A liquid mixture of methanol and water at boiling point is fed to a fractionating column at 2 0 0 kmo l h r . The mole fraction of methanol in the feed is 0 . 2 0 and the desired overhead ( distillate ) composition should contain 9 0 mole percent of methanol and the bottoms produce 9 8 mole % of water. A reflux ratio of 3 . 2 is to be
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T Stoichiometric combustion of isooctane, C8H18, is C8H18+a(O2+3.773N2)>bCO2+cH2O+dN2 Determine a,b,c, and d using atom balance. a= b= C= d=
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Coronene is a planar molecule with 18 conjugated carbon atoms, disposed on a circle of 0.84 nm. a) Draw the energy levels for the first 11 orbitals (huckle rule) in coronene and indicate the quantum number m for each of them. b) Use the particle on the ring model to calculate the wavelength of the excitation of coronene from m = 4 to m = 5. c)

A 600 MW coal electric power plant with 32% thermal efficiency substitutes 8% of its fuel with tree clippings, which are tree branches that are cut to clear roads as well as the access lanes (rights of way) of power lines. The tree clippings are fed to the boiler together with the coal. The coal used by the power plant has 83% carbon and a heating

A 2.38L sample of hydrogen chloride (HCl) gas at 2.50 atm and 32C is completely dissolved in 662 mL of water to form hydrochloric acid solution. Calculate the molarity of the solution. Assume no change in volume.

How can you tell which polymer sample corresponds to which curve on a graph when given viscometer DP, right angle light scattering, and refractive index vs retention volume graphs?

Methane, the principal component of natural gas, is used for heating and cooking. The combustion process is CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) If 15.1 moles of CH4 react with oxygen, what is the volume of CO2 (in liters) produced at 25.9C and 0.943 atm?

Following the example on the Distributed loading in a river (Lecture Notes), evaluate how far downstream of Point B could a point source outfall be allowed into the river with an in-stream impact of 14 mg/L if the stream UBOD concentration must never exceed 20 mg/L. (Use rough approximations wherever possible).

Sketch the velocity graduents that arise from drag flow and pressure-driven flow for a (a) Newtonian liquid and (b) a shear-thinning liquid

Does a higher refractive index correspond to a lower molecular weight polymer? Also, how can I tell which polymer sample is which on a mark houwink plot?

Please answer each of the following independent questions. a ) ( 1 0 marks ) Provide advantages and disadvantages associated with the use of cold - shot cooling versus independent heat exchangers for temperature adjustment between stages of an exothermic equilibrium - limited reaction for which the target conversion is at least 8 0 % b ) ( 1 0
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What volume will 3.98 moles of sulfur hexafluoride (SF6) gas occupy if the temperature and pressure of the gas are 137C and 5.77 atm?

In 2000 kg of water at 20 C, 7 kg of benzoic acid are dissolved, which are to be recovered by extraction with bezene, carrying out an operation in three stages in direct current and using 150 kg of benzene for each stage. Calculate the percentage of benzoic acid extracted.

Mixture of ethane (70%) and n-butane (30%) is flashed into a horizontal drum in which temperature and pressure are kept at 10C and 15 bar. Determine the compositions of liquid and vapor product streams by using the concept of distribution coefficient.

Kinematic viscosity 1.25x10-4 m2 /s and a relative density of 0.80, kg/m.s What is the dynamic viscosity value in terms of?

cylindrical shape pipe of radius 0.2 m is used in a chemical industry in the transferring process. The outside surface temperature of the pipe is 500K and the atmosphere temperature around the pipe is 200 K. The film heat transfer coefficient is 10 W/m^2K. An insulation layer is used for reducing the heat flow to the outside atmosphere of

Ejercicio 6 . 8 - 9 . Desarrolla la estructura de recirculaci n del proceso de alquilaci n de butano ( Ver ejercicio 5 . 4 - 1 0 ) . Asume que H 1 = - 2 7 , 4 4 0 B t u m o l , H 2 = - 2 5 , 1 8 0 B t u m o l , k 1 = ( 9 . 5 6 1 0 1 3 ) e x p { - 2 8 , 0 0 0 R T ( R ) } h r - 1 y 2 = ( 2 . 4 3 9 1 0 1 7 ) e x p { - 3 5 , 0 0 0 R T ( R ) } h r r -
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Example 13: What is the pressure pA in the figure? The density of the oil is 800kg/m3
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What are the similarities and differences between the imaging mode and the diffraction mode in TEM?

Explain the mechanisms of diffusion in solid - state materials. Describe the different types of diffusion in solids.

Given that there is a counter-transport of 3 moles of A and 5 moles of B in the film between a permeable membrane and the bulk. The film between the membrane and the bulk is 4 microns thick. The concentration of A at the bulk is CA,bulk = 1.5 M and at the interface is CA,i = 5 M. Under steady state conditions, derive the concentration profile

4. Calculate the energy of Gibbs, enthalpia and mixture entropy when 1 mol of hexane (C6H14) is mixed with the mole of heptane (C7H16) to 298 K. Try the solution as an ideal. Step by step

UNIVERSTI Kebangsaan 1 . A vessel's shell has an internal radius of 3 6 " . At the design temperature, the material's allowable stress is 1 5 , 0 0 0 psi. The pressure on the shell is 1 5 8 ( static head is already included ) . The joint efficiency is 1 . 0 . a ) Determine the minimum required thickness for the shell. b ) If the above 3 6 "
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Use the Van der Waals equation to calculate the pressure exerted by 2.00 mol CO2 in a 2.00 L container at 373.15 K and compare your answer to the pressure calculated for ideal behavior

Suppose the tank is operating in the steady state of part (a) with all flow rates and amounts as indicated in the problem statement, T1 = 20C, and T = T2 = 30C. Now the heater is shut off. Assuming the tank is perfectly insulated from the surroundings, write and solve the differential equation for the tank tem- perature T(t). How many minutes will

Question 2 . ( 4 0 pts ) The elementary liquid phase reaction C 6 H 6 + H N O 3 , C 6 H 6 N O 2 + H 2 O is carried out adiabatically in a CSTR for which the shaft work can be neglected. An equimolar mixture of C 6 H 6 and H N O 3 enters the reactor at 3 0 0 K with a volumetric flowrate of 0 . 0 0 2 m 3 s with a C 6 H 6 concentration of 0 . 0 0 0 1
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Please read the question and solve. The diameter of the shaft is about 4 feet. Estimate the time it took to raise or lower the cage 1500 feet. Now imagine youre in that cage. In the dark. Twice a day. With 59 other people.

Given the an experimental TDS of 1,179.3mg/L and a conductivity of 1.851mS/cm at 18C. What is the TDS factor? Report your answer to 4 decimal places and no units
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A new method was developed for the analysis of opioids in urine samples. The following data was obtained via the calibration curve method for opioid A . ) Signal intensity + - standard deviation ( a . u . ) * 0 2 0 + - 6 . 6 5 3 0 + - 4 . 5 1 0 4 0 + - 2 2 0 6 5 + - 5 4 0 1 0 5 + - 1 0 . 5 6 0 1 5 0 + - 2 2 . 5 8 0 Calculate the limit of detection
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What are the similarities and differences between the imaging mode and the diffraction mode in TEM?

c) A brittle ceramic rod contains a semi-elliptical opening, crossing the thickness of the part. Upper material has resistance maximum tensile strength of 600 MPa, a Young's modulus of 400 GPa, and a toughness 5.50 MPa.m7/2, A force F of 200 kN is applied along the length of the rod. The rod has an S section of 10 cm? (area of the plane normal to

Written Assignment Compare the prices of electricity produced by: 1. CANDU reactor 2. Coal 3. Natural gas at capacity factors of: 1. 20 percent, 2. 80 percent
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with the aid a sketch, briefly describe the phenomenon of passivity. Name two common types of alloys that passivate.

If a GC capillary column is 30 m long with outer diameter of 250 m, it would be characterized as Pick the best answer. Group of answer choices A) A good all purpose column with medium resolution, good capacity and moderate speed B) low resolution, fair capacity and fast C) low resolution, very good capacity and slow D) high resolution, slow and

Draw a P&ID for a deli meat facility. I just need the downstream process of a Washer, grinder, mixer and oven.

PCl5 Moldietil cier 1. NaH 2
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Mineral oil enters a pipe (inner diameter 10 mm) at a rate of 0.1 kg/s. The inlet temperature of the oil is higher than the temperature of the pipe. For the calculations use the following values: Pr_oil= 500, _oil=800 kg/m^3 , _oil=310^(-2) Pas A. Is the regime laminar? B. Calculate the hydrodynamic entry length and the thermal entry length.

Standard Addition Analysis of perchlorate (ClO4-) Calculate the concentration (Cs) of ClO4- in an 50.00 mL unknown solution with a measured potential of 368.9 mV. The sample was spiked with 1.00 mL of 0.0500 mol/L ClO4- and the potential was measured to be 344.2 mV. If the experimental slope is 57.13 mV/decade, what is the concentration of the

dimign atgorithin. Your design requires 106 tubes in a 4 . puss (424 tubes ) of 3/4tubes, with a triangudar pitch of I inde. What is the shell diameter
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Consider the following competing hypotheses: Ho: Pxy 20 HA: Pxy < 0 The sample consists of 35 observations and the sample correlation coefficient is -0.35. table.) viturit mak 500-10-5 DE MESA 350.00

For a steel alloy it has been determined that a carburizing heat treatment of 15 h duration will raise the carbon concentration to 0.35 wt% at a point 2.0 mm from the surface. a.) Estimate the time necessary to achieve the same concentration at a 6.0-mm position for an identical steel and at the same carburizing temperature. b.) What surface

I shot the photo below from the window of an aircraft, which was cruising (approx. steady state conditions) at around 900 km/h. The momentum boundary layer over the aircraft wing is clearly visible. A. Please explain briefly (max 3 sentences) the momentum boundary layer and its characteristics. B. Which dimensionless number(s) fully describes the

Consider a 1D planar wall of thickness L with thermal conductivity k_1. The system is described by the following governing equation, boundary and initial conditions: (^2 T)/(x^2 )=1/ T/t -k_1T/x=h_1(T_-T(x=0)) x=0,t k_1T/x=const>0 x=L,t T(x,0)=T_0 t=0,x[0,L] Assume T_0

Consider conductive heat transfer in He gas. Assuming the billiard ball model: how would you expect the thermal conductivity, diffusion coefficient, and viscosity to change locally if: a. The local temperature changed from 300 K to 1200 K (i.e. what factor would it increase/decrease)? b. The temperature was constant, but the gas is now Ar? c. Now

3.What is the normality of a solution of H2O4 if it has a specific gravity of 1.84 and contains 95.0% H204 by weight? 4.A 0.5M solution of H>SO4 is the same as H2SO4
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What is the heat flux (W/m2) from a black body if the temperature of the body is 28C ? 721 640 467 352
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The units of thermal diffusivity are (select all correct options) m2/(skg) kJ/(kgC) m2/s none of the above W/(mK)
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Determine the downstream thickness of a wire coating for 8 AWG wire (DW=6.36 mm) if the wire take-up speed is 100 cm/s, the die diameter is 6.7 mm, the land length is 2.68cm and the extruder exit pressure is 4250 psi.

How is shorter maternity leave periods for mothers which can cause an infinte amount of problems connected to chemistry? What type of hormones are involved? please help

Chapter 6 Phenolic Compunds (PLEASE ANSWER ALL a TO f) a. Ginkgo contains two sets of bioactive compounds. What are they? b. Draw the structure of Bilobalide. PLEASE ILUSTRATE c. What class of compound does it belong? d. A common flavonoid found in nature is quercetin. What is its structure? e. What is the key difference between a flavone and

Refrigerant-134a is throttled from a saturated liquid at 0C to -30C. What is the phase of the r-134a after the throttling process? Select one: a. Superheated Vapor a. b. Saturated Mixture c. Compressed Liquid D. Saturated Vapor E. Saturated Liquid

Calculate the boundary layer thickness for a disk rotating at 300 RPM if the kinematic viscosity of the liquid is 0.01 cm2/s and the diffusivity of the fluid is 1 105 cm2/s.

Within a 1D planar wall of thickness L there is uniform heat generation. The wall is isotropic (constant value of the thermal conductivity) and it is in steady state conditions. The two boundary conditions are: T/x|_(x=0)=0 at x=0 T|_(x=L)=T_1 at x=L At which x the maximum temperature of the wall would be? A. x=0 B. x=L/2 C. x=L D. The temperature

Consider an object cooling down by forced convection. If the lumped capacitance method can be used, then we can assume: A. The solid has an infinitely large thermal conductivity B. The solid has a vanishingly small thermal conductivity C. The thermal resistance within the solid is comparable with the thermal resistance of the adjacent medium Which

applicd tensile load is 44kN ealealate the specimen final diameter 12.022mm 2. 11.978mm 12 mim .11.95min
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Calculate G0 and the equilibrium constant for the following reaction at 25C using the given data: C(graphite)+2H2(g)CH4(g) Data: Standard enthalpy of reaction H0298=74830J
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Suppose we have a water pump operating at 20 m head with a flow rate of 108 m 3 h -1 , with water density given as 1000 kg m -3 . If the pump efficiency is 0.8, what is the total energy, in kJ, input into the pump over a period of 19 minutes? Give only the numerical part of your answer, to 3 significant figures

Saturated steam condenses over a vertical flat surface. Consider condensation happening as film condensation. In these conditions, the local coefficient of heat transfer for condensation: which one is correct? A , B, or C? A. Remains constant from the top to the bottom of the vertical surface B. Decreases with increasing distance from the top of

5) Consider the instantaneous streamlines for the flow around/within a cavity (Fig. 5). Explain what you see in these images
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choice.-temp 3.11. The Carnot cycle is defined as having a certain specific first step, the isothermal expansion of a gas. Can a Carnot cycle start at step 2, the adiabatic expansion? Why or why not? (Hint: See Figure 3.2.) ure-yolume

The degree of dissociation for the decomposition of NO, is 0.201 at 298.15 K and 1.00 bar total pressure. Calculate for the equilibrium constant at the standard condition. What is the equilibrium constant at 373.15 K (Standard enthalpy of formation = 56.2 kJ/mol)?

Annotative Bobliography of challenges and opportunities of solvent based additive extraction methods for plastic recycling

how does the molecular weight and degree of crystallinity influence the physical properties of polyethylene?

Use the Peng-Robinson EOS to estimate each of the following properties of 1-propylene. a.Vapor preassure at T=25 b.Fugacity of staurated vapor at. T= 25 c.Fugacity of saturated liquid at T=25 d.Fugacity of compressed liquid at T=25 and P=500 bar e.Normal Boiling Point Please help me with this one!! Thank you!

A 25C, para la reaccin: Br2(g) 2Br(g) tenemos G = 161.67 kJ/mol y H = 192.81 kJ/mol. a) Calclese la fraccin mol de tomos de bromo presentes en el equilibrio a 25C y P = 1 atm. b) A qu temperatura tendr el sistema 10% en mol de tomos de bromo en equilibrio con vapor de bromo a P = 1 atm? (ya se habia respondido esta pregunta pero desde la

An irreversible, gas-phase, first order reaction, in a PFR gives 50% conversion. An additional PFR reactor is constructed to raise the conversion to 80%. What is the new reactor's size in relation to the original reactor? What is the reactor volume (in comparison to the PFR) required for 80% conversion if a CSTR is replaced?

Determine the pressure of saturated water vapor at 714.7 F and a specific volume of 0.59561 ft3/lbm, assuming an ideal gas state. Report your answer with units of psia.

Q2. (20 p) Determine the stability of the overall closed loop system given below by using the Routh Test
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How to draw a tangent line through each data point in Excel to obtain the slop of each point in a graph?

Determine the indices for the plane shown in the cubic unit cell
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Find the h max by Bernoulli equation integration form. My course is Chemical engineering fluid mechanics! please in need hand solving on paper with final answer . Thank you
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please solve briefly 2-33p) Descrmine the stability of the overall closed loop system given below by using the Routh Test
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What is the permissible time using OSHA criteria for a worker exposed to a 102 dBA noise during an 8 hour work shift? Calculate the time.

Problem: AUTOCAD PLANT DESIGN 1.Take a rectification column as an example to carry out the detailed design of the column, and draw the column equipment condition diagram. It is required to submit the image of the whole process of tower design, and the dwg file of the tower equipment condition diagram. Must need Dwg cad file. If i get right answer.

From the predominant mechanism of transportation. What order is the (filtration - pore transport) process in terms of transport kinetics? is it first or zero oeder? Justify your answer**

Jne slip system for the BCC crystal structure is {110}. Sketch this plane along with the BCC atoms and identify two different slip directions within this plane
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Nitrogen Fixation Using the Fenton Catalytic Process to Enhanced Agricultural Productivity

1. Get the process flow diagram of Toluene Hydrodealkylation in Aspen Plus. Make sure to include all specifications and a steam table.

10 (1 point) How much work is required, using an ideal Carnot refrigerator, to change 1.0 kg of tap water at 8C into ice at -14C? Assume that the freezer compartment is held at -14C and that the refrigerator exhausts energy into a room at 24C. = Take Cwater = 4,186 J/kgC, Cice = 2,090 J/kgC, Lf 333,000 J/kg, and absolute zero to be at -273C. [

One slip system for the HCP crystal structure is {0001}. Sketch this plane along with the HCP atoms and identify 3 different slip directions within this plane
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Select the oxidation number for the indicated atom in the following molecules: (a) Cs in Cs2O (b) I in CaI2 1 0 +1 (c) Al in Al2O3 2 +2 +3
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The gas phase reaction: 2 A ( g ) + B ( g ) - > D ( g ) + 2 E ( g ) is taking place. 8 mol / s A and 4 0 % excess B are mixed and fed to the reactor at 2 0 0 \ deg C . The conversion of component A in the reactor is 8 0 % and the outlet temperature is 3 3 0 \ deg C . Using the heat of formation method, taking the elements in their standard states

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