Chemistry Questions and Answers June 15, 2020

Propose a plausible synthesis for the following transformation. Choose from reagents (A-H):

Propose a plausible synthesis for the following transformation. Choose from reagents (AH) A 1) NaNH2 2) Mel 3) 9BBN 4) H20, NaOH 1) Brz 2) Excess NaNHz 3) H20 1) Brz 2) Excess NaNH2 3) H20 4) H,SO4, H20, HgSo4 1) NaNH2 2) Etl 3) Na, NH, () H. 1) 9BBN 2) H202, NaOH 1) Excess NaNH2 2) H30 3) Brz (1 eg), CCl, 1) Excess NaNH2 2) H20 3) NaNH, 4) Mel 5)

Arsenic acid, H 3 AsO 4 , is a polyprotic acid with 3 acidic protons. The equilibrium below shows the dissociation of the second acidic proton in water: HAsO24(aq)+H3O+(aq)H2AsO4(aq)+H2O(l)HAsO42(aq)+H3O+(aq)H2AsO4(aq)+H2O(l) Identify the weaker acid then predict whether the equilibrium lies to the left or to the right . Group of answer choices

The molarity of the Cu and Zn solutions used in the setup of the electrochemical cell was 1 M. Explain why the voltage was not equal to the standard cell potential for the CuZn redox reaction at all times during the experiment.,Experiment 2 Concentration and Voltage Initial Cell Potential After Adding 6 mL of KHAsO4 After Adding Another 6 mL of

At what temperature (if any) would the rotational and vibrational contributions to the Gibbs energy of HF be equivalent (this one is tricky).

Compare the results you obtained for the two samples using the BCG and Biuret method. Your discussion should include the following points: a. Was there any significant difference between the two methods? b. What differences you may expect to see between the two methods (e.g. what are their comparative limitations, do they behave differently

In most enzymes , the active site consists of only a few amino acids interacting with the substrate are the rest of the amino acids necessary

Given the following Thermodynamic Quantities at 298.15 K (25 C) Substance AH (kJmol) S (JKmol) Cl2 (8) 222.96 P2 (g) PCI3 (g) 144.3 218.1 288.1 311.7 P2 (g) 3CI2 (g) 2PCI3 (g) For the reaction above please answer the following questions A). What is the value of AS rxn at 25C kJ B). Is the reaction spontaneous or not spontaneous at 25C C). Above

How is the pentose phosphate pathway related to oxidative stress? Explain in detail.

For the hydrogen atom in the 5d (I 2) excited state, select each of the following which is a set of possible quantum numbers (, m.j, s, m, m) followed by the correct term notation for each set. O (2, 1, 6, 12, 12, 12) and 520, O (2, 0, 32, 12, 12, 12) and 52D12 O (2, 1, 52, 12, 12, 32) and 5202 O (2, 2, 32, 12, 12, 32) and 52P, P32 O (2, 0, 32,

You are supervising a student whe is converting reactant A to product S Platas AandKeomepond to the Tt pu tant Apadunnte the following TLCs which of these statements are correct el et REacrant Procuct Reaction misture TLC ,O TLCX of reaction mature shows presence of product (B) as well as unreacted reactant (A) O Reaction mxture TLCX shaws that

Citric acid is a tripotic acid (H, A) whose anion (A) forms stable complexes with many metal ions. Ca A CaA When a Ca ionselective electrode with a slope of 29.58 mV was immersed in a solution having Ace 1.00 x 10, the reading was 1.89 mV. Calcium citrate was prepared by mixing equal volumes of solutions 1 and 2. Solution 1 Ca 1,00 x 10 M, pH

1. Beaker 1 was held with crucible tongs just above the surface of the boiling water bath (a 400 mL beaker containing about 200 mL of tap water and a few boiling chips). 2. Beaker 2 was heated in the same way. 3. Into beaker 2, the contents of beaker 1 was slowly added while stirring constantly. After stirring for about 5 minutes, a homogeneous

Calculate pM at each of the points in the titration of 35.00 mL of 0.05557 MM by 0.1000 MEDTA at 25 C with a pH of 9.00 and ionic strength of 0.10 M. The log Kr for MEDTA complex is 12.45. (5 points each) a. After the addition of 10.00 mL of EDTA b. At equivalence point C. After the addition of 28.00 mL of EDTA

Fresh Water Bentonite (FWB) Mud used to drill a Formation (Pore Pressure 2275psi, Fracture Pressure 3200 psi, Rock Density 35.8 ppg, Depth 5000 ft.) by using Drilling String with the following detail 3D V DP Do5, Di4.2, Length 4000ft. V DC Do8, Di3 V Bit Size 17 1. Draw well profile and mention all depths, sizes 2. What is the recommended Mud

Use the information in the table below to answer the quiz questions. The information in the table are for the manufacturer. Variable cost Selling price without sales promotion Selling price with sales promotion Average sales (units) Sales when on promotion (units) Sales after promotion (units) 1.25 3.00 2.50 2,500 3,500 2,200,What is the gross

Use the ionic model, determine the formal oxidation state of the metal, the number of d electrons, and the total electron count for the complex. Show the calculations involved for each complex. (5 x 4 marks) (a) (b) PR3 HOso H,0 PR3 (c) (d) PPH3 .CO CRu PPH3 oc W.co H3C Me. Me Me Me Et (e) C. MezSiH2C Ta Me,SiH,C CH2SIME3 T.ICH SIMes R O Ul

Explain what is meant by zeroorder and firstorder kinetics, and how this relates to the following formulae dxdt a dxdt k.x, What is the unit for x, Xr, t, a, k What is meant by halflife Relate these kinetic expressions to diffusion and carriermediated translocation.

1) What is the role of zinc in the structure of ATCase and how does using p-hydroxymercuribenzoate contribute to the dissociation of the ATCase subunits? 2) Provide an example of allosteric regulation and explain in your own words how the enzyme is regulated

(a) A student has prepared a mixture of benzoic acid (pKo 4.20) and aniline (pkb 9.40) in a buffer solution of pH 2.0. The mixture was extracted using 15 mL of diethyl ether. Analyse the extraction efficiency. (7 marks) NH, Benzoic acid Aniline Explain the procedure of QUECHERS method that can be used for the extraction of pesticide residues in

13. (10 pts) 1,4dioxane (CaHO) is an emerging contaminant in groundwater. A bacterium Pseudonocardia dioxanivorans CB1190 can oxidize 1,4dioxane as the sole energy and carbon source. Determine the true cell yield (Y) of CB1190 growing aerobically on 1,4dioxane. The Standard Gibbs Energy of formation (G) of 1,4dioxane is 200 kJmol. Assume pH 7,

Consider the following equilibrium: 2NH3g=N2g+3H2g G0=34.kJ Now suppose a reaction vessel is filled with 8.03atm of ammonia NH3 and 2.74atm of hydrogen H2 at 606.C. Answer the following questions about this system: Under these conditions, will the pressure of H2 tend to rise or fall? rise fall Is it possible to reverse this tendency by adding N2?

Fill out the rest of the chart. Concentration of iodine solution :2% %v/v iodine solution volume of unknown sample uses: 100 ml unknown sample was diluted before titration

. ANALYSIS OF AN UNKNOWN SAMPLE CONTAINING VITAMIN C Sample II 100ML OmL II Mass or volume of unknown Initial buret reading, mL Oml Final buret reading, mL 32.3 33 5 33.3 Volume Iz added, ml 5ml 15ml 15ml Moles of iodine added Moles of vitamin C in sample Mass of vitamin C in sample, mg Concentration of vitamin C in liquid sample, mg100 mL Amount

Consider the Molecular Orbital diagram for the ion H2 (An H2 ion with 3 e). Predict the bond order. 2.0 0.5 1.0 1.5 Submit Answer Tries 02 Consider the following statements. v) Will the ion be paramagnetic or diamagnetic Submit Answer Tries 02 ,Decide the mechanism by which the following alkyl halides will be converted to alcohols by the

A 35 ft. tall water tower in Houston, TX (from base) is used to deliver water to a processing facility located 1.43 miles away. Piping is used to deliver the water from the base of the tower to the facility at a rate of 28,500 fth. The pipe is placed underground according to city regulations (cite source in your calculations). For this assignment,

Determine the intermediates and product(s) for the following synthesis sequence. H D ole HyC CH DHO ol ole f HC CH D H LDA CH Hc Reset

A patient presents to the emergency department with profound postural hypotension, hyponatremia, hyperkalemia, and his skin is darker than usual. Which of the following diagnostic tests should be carried out as soon as possible baseline serum cortisol measurement plasma ACTH measurement short ACTH stimulation test Idexamethasone suppression test

The thermodynamics study of pentane, and hexane mixture is important for distillation purpose. Determine the conditions that the mixture forms a single and a twophase system. Analyze how pressure and temperature will affect the phase state of the mixture. If a small amount of propane is added to the mixture, how the system phase state will be

The river water source is categorized as hard water due to the high concentrations of magnesium and calcium ions. Explain ONE (1) negative effect of water hardness. With the concept of solubility and solubility product, identify the unit process needed to treat this problem and hence, discuss the process by outlining the relevant chemical

River water Unit process 1 Aeration Unit process 2 Clarks process Unit process 3 Coagulation flocculation Treated Unit process 5 water Unit process 4 Endusers Disinfection Filtration

The Prime Ministers of Angria and Avalon announced in 2015 to connect Angria and Avalon by 2021 through a high-speed rail link. The construction of the high-speed railway started in 2016 and is expected to be completed on time. Buranda Co Ltd is the sole company that specialises in the operation of rail passenger service in both countries. The

Sketch a diagram for the borondoped indium phosphide wafer indicating temperature dependence of the conductivity. The sketch must have a plot of the conductivity on the appropriate axis. You also must also label each axis, describe the trends in each region quantitatively, and label the various regimes in the data. Pertinent data for the

a) Explain the function of magnetic coils and radiofrequency transmitter. b) Discuss the advantages of using a magnet with as great a field strength as possible in NMR spectroscopy (8OMHZ vs 400 MHz). Describe your answer by using an alkyl substituted benzene ring as an example (you may choose benzyl alcohol). c) Decide if a more deshielded

2. The relative reactivity of carbonyl compounds toward nucleophiles is shown below. Explain why this is the trend. (Hint compare with substituent effects in electrophilic aromatic substitution.) (6 pts.) R H. R R R OR most reactive least reactive toward nucleophiles toward nucleophiles

The end of the mechanism for ketal formation is an SN1 mechanism. Explain.

Show how to make pfluorotoluene from toluene. (You cannot use F2)

5. Draw the mechanism for this reaction. (6 pts) NaOCH, 2.

6. The following reaction was observed. Identify the reaction types involved and draw a mechanism. (If a series of steps repeats, you can draw it once and indicate the of times it repeats.) (14 pts.) acid XS H

7. Show how to make pentylamine using the Gabriel phthalimide synthesis. Then show how to add a single propyl group to the nitrogen. (6 pts.)

8. Draw the structures for A, B, C, and D. (8 pts.) NBS NaN, 1) LIAIH, 2) H,0 base

9. Draw the structures for A, B, C, D and E. (10 pts.) Mg A 1) A Na,Cr,0, AIC, 2) acid H,SO,

Give reagents A, B, C, and D. A

What is wrong with the following reactions (16 pts.) AICI, AICI, a. NH2 NH2 b. AICI, OH Mg 1) acetone HN. C. H2N. Br 2) acid HO AICI, CI d.

Discuss the magnitude of the glass transition temperatures with respect to polymer structures presented in Table 1A. ,Table 1A Repeat unit TalC) Tm (C) Atactic Polystyrene 96 Not observed Syndiotactic 100 270 Polystyrene Nylon 66 70 255 O Jn 327 400 Poly(pphenylene terephthalamide) HN (8 marks)

A peptide with the sequence of ACKQMNP was first treated with iodoacetate and then subjected to multiple rounds of Edman degradation, draw the Edman degradation product of the second round. Below is the structure of Edman reagent. You need to draw the correct chirality of the chiral centre if it is evident. NCS

Write notes on controlled radical polymerisation. Include three methods of controlling radical polymerisation showing the mechanisms of control and include examples of each polymerisation including suggestions for relevant monomers and initiators. In your answer also show how block copolymers can be produced using the three methods of control.

Draw the molecular orbital diagram.

Given the following hypothetical species, Ne,, CP, KrF, explain how Molecular Orbital Theory can be used to predict the existence, orbital interactions, bonding, electron configurations, and physical and chemical properties of the species. Explain if there is any possibility of electron excitation to occur in each of the species. Assuming that CP

Provide the structure(s) of the expected major organic product(s). Unless mentioned otherwise, you can assume that all reagents are present in one mole. Show stereochemistry where needed and write NR if there is no reaction. a. 1 mole HBr NH2 Write all possible products. CH,OH b. CO. OH HIO, (5 moles) CH2OH . CH(CH3)2 H2, PdC HO d. 1. NaCN, HCI

25. Which of the following is EALSE about the observed properties of gases A) Gases will expand because they have no definite shape or volume B) As the temperature increases, the pressure will increase (especially in a closed container) C) Gases have very high densities D) Gases are completely miscible 26. According to Charles Law, at 25 degrees

Calculate the percent dissociation of 1.46 M ascorbic acid (C5H7O4COOH) solution. The pka of ascorbic acid is 4.10. Assume the 5% approximation is valid to compute the percent dissociation to three significant figures.

Using the molecular orbital diagram below, determine the bond orders and molecular orbital electron configurations for O, and O Also determine if each is paramagnetic or diamagnetic. 2p 2p

4. People who have swallowed poisons such as mercury salts, copper salts, or lead salts are given egg white or milk. Why 5. The treatment described in (4) above is followed by an emetic. Why

The relative reactivity of carbonyl compounds toward nucleophiles is shown below. Explain why this is the trend. (Hint compare with substituent effects in electrophilic aromatic substitution.) (6 pts.) R R R R OR most reactive least reactive toward nucleophiles toward nucleophiles

6. Find the median and all pure Nash equilibria of the corresponding doctor location game for the left tree in Figure 4.13. Figure 4.13. Two trees

Given the temperature and pressure are constant, which is the proper relationship between the number of moles of a gas (n) and its volume (V) (6 pts) Ov k OV kn OV k n 3D OV

The normal boiling point of liquid propyl amine is 322 K. Assuming that its molar heat of vaporization is constant at 30,3 klmol, the boiling point of CllNH, when the external pressure is 1.35 atm is K.

Solid zinc acetate is slowly added to 175 mL of a 0.0604 M sodium cyanide solution. The concentration of zinc ion required to just initiate precipitation is M. Submit Answer Try Another Version 9 item attempts remaining

Calculate the formal potential, E, for the given reaction. NO, (aq) 3 H (aq) 2 e HNO, (aq) H, O(1) E 0.940 V Nitrous acid, HNO,, has a K, of 7.1 x 104. E .44 V

(a) Draw the resonance structures of acetyl cyclopentadienyl anion and state the effect of acetyl group on Ferrocene second acetylation regioselectivity. (b) Based on your answer to question (a), rank the three possible regioisomers of diacetylferrocene from the more to the least likely to form. Explain.

A mixture of cyclohexene and ethanol boils at temperature of 66.7C with the composition of 35 ethanol. Boiling point of cyclohexene and ethanol are 82.75C and 78.3C, respectively. Construct the boiling point versus composition diagram for cyclohexene ethanol mixture system with all points and curves on the diagram. ,A mixture of cyclohexene and

The product of the following reaction is Ph2CuLi Br Ph Ph Ph Ph

Complete the table

name formola mmol densitylconc. anount 300 mg 300g Mol.es Mw 4methyphanylboranic ecid CHq B0z Haroro4nitcobenere Katy BrNO Paladiun (1)Actate CyHOuTd IriphenylancsphineCirs HISP Nez Co (ag) Pepanol 2245 0.008 262,25 0024 Sinct 1.0 64mg IM 2.0mL 4.0mL

An analytical chemist is titrating 74.3mL of a 0.7400M solution of acetic acid HCH3CO2 with a 0.2200M solution of KOH. The pKa of acetic acid is 4.70. Calculate the pH of the acid solution after the chemist has added 275.mL of the KOH solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the

What is the molecular geometry for the metal complex [Ru(CN) 3 (terpyridine)] - ? how would you construct a Molecular orbital diagram according to that? Ruthenium has an oxidation state of +2 in this complex.

OR N Draw MeSSPh in reactive conformation N. Label of orbital of MeSSPh

The pH of tap water distributed throughout city "xyz" has now been adjusted to approximately pH 7.5. Find out how and why and investigate what effects this would have on us and the environment.

X Use a feed composed of AGO and VGO coming out from a distillation unit with a conversion of 70 in a oncethrough operation with a zeolite catalyst. Atmospheric gas oil Light vacuum gas oil Heavy vacuum gas oil Total BPD 7451.65 4662.92 24635.5 36750.07 Sulphur Tonday Tonday 1050.78 21.169 666.143 27.888 3674.16 169,032 5391.083 218.089 8.2. If

An experiment was carried out to investigate the effect of concentration on the reaction BrO3 (aq) 5 Br (aq) 6 H (aq) 3 Br2 (1) 3 H20 (I) The following data was obtained Initial BrO3 Initial Br Initial H Initial Rate Trial (molL) (molL) (molL) (molLs) 1 0.10 0.10 0.10 8.0 x 104 2 0.20 0.10 0.10 1.6 x 103 3 0.20 0.20 0.10 3.2 x 103 4 0.10 0.10

A Pu-239 fueled reactor is operating at a steady state power of 3000MWth. (see table 7.2 and example 7.6) a) The reactor is scrammed by inserting 15.0% negative reactivity via control rods. What is the reactor power immediately after the scram? b) What is the power 10 minutes after the scram? c) What do these calculations not account for, in terms

Ae Ae e one delayedgroup model and by a sum of seven exponentials in the more stic case of six delayed groups Ae Ae ... Aret. TABLE 7.2 DELAYED NEUTRON FRACTIONS Nuclide B (thermal neutron fission) 232Th 233 U 235U 238U 239 Pu Fission induced by prompt neutron spectrum. 0.0026 0.0065 B (fast fission) 0.0021 0.0203 0.0026 0.0064 0.0148 0.0020

The resistances of CH3COOCI3 solutions of various concentrations measured at 25 C using a conductivity cell with a cell constant of 0.2063 cm1 are given as follows. C mol.L 0,0005 0,001 0,005 0,010 0,020 0,050 Rohm 3314 1669 342,1 174,1 89,08 37,14 a) limit molar conductivity b) dissociation constant

1. One of the following is not a complication of an increased vertical dimension in a dental prosthesis A Pre a mature contact of the occlusal surfaces. B Denture instability. C Increased gag reflex D The patient senses a bulky denture.

Citric acid can be produced in three ways. One is extraction from fruits. The second is synthesized by chemical methods, i.e., made by condensation of oxalylacetic acid with vinyl ketone. The third is made by fermentation. Please elaborate on the process routes of the latter two methods by reviewing the literature.

2. (12 pts) Interpret all of the given data and determine the structure of the compound with a molecular formula of C10H11XO that is consistent with the data given below. (Hint Use the provided table to organize your H data.) For full credit, be sure to identify X. MS M 226 mz, M2 228 mz These peaks have equal heights 3D IR (cm1) significant

Which compound would be the strongest base NH2 O b. NH2 Oc. NH2 NO2 d. NH2 NH2 e. CH3

Indicate all resonance structures that contribute to the stabilization of the intermediate in the reaction below NO2 HNO3 H2SO4 O a. NO2 NO2 H O b. NO2 H NO2 O c. NO2 H NO2 Od. NO2 NO2 H O e. O NO2 H NO2

For the compound below compare the indicated protons and determine whether they are homotopic, enantiotopic or diastereotopic H H Select one O a homotopic O b. enatiotopic O c. diastereotopic

Which compound would be the strongest base NH2 O b. NH2 Oc. NH2 NO2 d. NH2 NH2 e. CH3

Question 9 4 pts When the methyl ester of 4oxopentanoic acid (methyl 4oxopentanoate) is reacted with MeMgBr the product would contain which of the following functional groups two secondary alcohols a secondary and a tertiary alcohol two tertiary alcohols a tertiary alcohol and a ketone a secondary alcohol and a ketone Question 10 4 pts When methyl

Determine the empirical formula for the compound with these spectra. L0D 4000 3000 2000 150 1000 500 HAVENUMB ERI 1l 100 MSIW2852 80 60 40 20 20 40 60 80 100 120 140 160 180 200 220 mz Relative Intensity

Which compound has this NMR spectrum 11 10 8 7 4 3 2 HSP01418 ppm Integrations 51223 NH2 NH NH NH

Show clearly how a retrosynthetic approach may be used to devise the synthesis of the following compounds using readily available organic and inorganic starting materials and reagents. Your answer should include a complete retrosynthetic analysis, reagents and reaction conditions. ,OAc Ph Ph from ethyl formate (6)

Give the major product of these.

H2 (g) PtC catalyst

Give the major product of these.

HBr CH2CI, solvent tBuOOMe hv

Give the major product of these.

1. O3 2. H2O2, H20

The stationary phase of the SPME fiber has a key role in determining the efficiency of this extraction technique. Figure 2 shows the total peak area of the volatile compositions in honey extracted using different types of fibers which are carbowax polydimethylsiloxane (CARPDMS), polyacrylate (PA), and polydimethylsiloxane (PDMS). 90000 80000

Using the data, calculate the molal freezing point constant (Kf) for cyclohexane.

Determining the Freezing Point of Pure Cyclohexane S Temperature when arystals start to form 6.6 C (rial 1) 6.6 C (trial 2) 6.6 Av. T Part II. Determining the Molal Freezing Point Constant of Cyclohexane A Detemining the Molal Freezing Point Constunt of Cyclohexane by Observing the Freezing Point S Mass of pdibromobenzene 0.268 S Temperature when

Let G be a group acting on a finite set X. a. Let G 15, X 17 and assume that every orbit contains at least 2 elements. Find the number of orbits and the cardinality of each of them.

What is the change in pH that occurs when 0.50 mmol of a strong acid is added to 100 ml of 0.0800 M lactic acid 0.0200 M sodium lactate (Ka 1.38 x 10 Select one O a. 0.21 O b.0.12 O C 3.26 O d. 3.13

Which of the following is NOTA reaction unit upon which the number of mole equivalents can be identified Select one O a. Pair of electrons that is donated or accepted O b. Number of moles of H and OH O C. Number of electrons that is donated or accepted o d. Number of ligands

. Match the following aqueous solutions with the appropriate letter from the column on the right. 1.0.250CH3C00 A.Highest boiling point B.Second highest boiling point C.Third highest boiling point D.Lowest boiling point m 2.0.157 Ba(NO3)2 3.0.280NANO3 m 4.0.530Glucose m (nonelectrolyte) 8b. Match the following aqueous solutions with the

1. Gas transport in a porous medium The evolution of the density u of a gas flowing trough a porous medium can be described by the so called porous medium equation for m 1, (1) du Au 0. For space dimensiond in the domain R x (0, ox) the equation has a radially symmetrict exact solution, the socalled Barenblatt solution b(x, t) a(m 1)r2 2dmt

Cd(CN)4 complex K,6.03 108 at 25 C. For the aqueous Suppose equal volumes of 0.0068M Cd(NO,), solution and 0.26M KCN solution are mixed. Calculate the equilibrium molarity of aqueous 2 ion. 2 Round your answer to 2 significant digits.

What is the major product from the following reaction 1.SOCI, OH 2. LIAIH, 3. H,0 HO. H. O a 3 Ob. 2 Oc. 4 Od 1

What is the 4,G for the following reaction (in kJ mol) at 298 K 2 Si (s) 3 H2 (g) SizH6 (g) The conditions for this reaction are PH2 1.58 bar PsiZH6 1.37 bar You will also need to use Appendix Il in your textbook (containing standard Gibbs energies of formation). A copy of Appendix II has also been posted on eClass. Please use the method of

3. Think retrosynthesis For each or the following reactions, we want to think about when we know to use them. Provide a structure of the functional group you are looking for in the product of each of these reactions. a) aldol condensation b) Claisen condensation c) Diekmann condensation d) Michael addition e) Robinson annulation 4. Provide a

The purpose of the experiment was to form pure triphenylmethanol through a multi-step synthesis. The first step was to convert the carboxylic acid (benzoic acid) into the ester (methyl benzoate) through a procedure called Fischer esterification. The second step was to prepare phenyl magnesium bromide, which is a Grignard reagent and to add it to

For B atom (Z5), a) draw an atom diagram showing all nucleuselectron and electronelectron interactions, b) write down the electronic Hamilton operator in atomic units, c) calculate the ground state energy (in eV) by applying independent electron method.

Complete the following reactions.

PCC el. Swern Ocidation n h). kz0, ht

Compare the initial pH and the capacity of Buffers C and D. Explain why these buffers have different or similar capacities. Buffer C is made up of 1M NaCH3COO @ 20 mL, 3M CH3COOH @ 33.33mL, H2O @ 46.67mL Buffer D is made up of 1M HF @ 6.59mL, 1M NaF @ 50mL, H2O @ 43.41mL

Buffer C added in ml for Buffer C pH w HCI pH w NaOH 4.06 4.06 2 3.61 4.32 4 1.43 4.52 6 4.7 4.87 10 5.06 12 5.27 14 5.57 16 6.22 Buffer D added in ml for Buffer D pH w HCI pH w NaOH 4.06 4.06 2 3.49 12.68 4 3.11 6. 2.7 1.96

A graduate student needs to prepare isotopically labeled phosgene gas, 13COCl2, for use in the synthesis of an organic compound (all the C atoms are carbon-13). The students place 3.59 atm of 13CO (g) and 2.75 atm of Cl2 (g) in a steel cylinder at 25 C, seals the cylinder, and heats it to 227 C. After the cylinder is kept at the elevated

(b) The solubility of codeine monohydrate (C18H21NO3 H2O) (M 317.38 g mo) at 20 C is 1 g in 120 cm of water. The pK, of its conjugate acid is 8.21. What is the highest pH at which a 4.5 (wv) solution of codeine monohydrate is completely soluble H HO Codeine

Q4.A.The following table shows the size distribution of dust sample and the fraction efficiency of removal in a gas cleaning equipment. Calculate the overall collection efficiency. 15 marks Dust size Weight per 100 g of dust (g) Fractional efficiency ni () 5 1 510 8 1015 4 14 1520 7 45 2025 9 66 2530 80 3035 7 88 3540 11 91 4050 15 92 5060 19 94