A solution of Tryptophan has an absorbance at 280 nm of 0.54 in a 0.5 cm length cuvette. Given the absorbance coefficient of trp is 6.4 x 103 Lmol-1cm-1. What is the concentration of solution?
Q: ieer is H2(9)+I½(9) → 2 HI(g) At the temperature the engineer picks, the equilibrium constant K, for...
A: A chemical engineer is studying the following reaction: H₂(g) +I₂(g) → 2 HI(g) Q = [HI]2/[H2][I2] We...
Q: Fill in the missing information-reactants or products-in each of the following reactions. F. a) n ra...
A: Solution Given that Find missing information reactants and products = ?
Q: If 119.3 g of PCI5 are formed from the reaction of 61.3 g Cl2 with excess PCI3, what is the percent ...
A: The correct answer is given below
Q: Acrolein test
A: The acrolein test is used to determine if oil or fat is present. When oil or fat is heated in the pr...
Q: fruits and vegetables
A: In this question we have to explain about the specific concentration of syrup and brine for fruits a...
Q: How do I do the calculation(s) here to determine the information I will need to enter/graph in Excel...
A: The species diagram represents the variation of concentration of different species in a system, with...
Q: What is the percent rate if a quantity is 1/1000 of the base?
A:
Q: A sample of H2 gas has a pressure of 1.2 atm at 25°C. If the pressure has increased to 1.5 atm at co...
A:
Q: A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gas...
A: As energy is absorbed so the given reaction is endothermic reaction. In this process energy is abso...
Q: 2) Calculate AS (for the system) when the state of 3.00 mol of perfect monoatomic gas atoms is chang...
A:
Q: The speed of a chemical reaction O a. is independent of the amount of contact surface of a solid inv...
A:
Q: CH3 CH3 Proterted diod lie ketal
A:
Q: Determine the AG (in kl/mol) for a reaction at 267.69 K, for which K, = 1.21x1010, Report your answe...
A:
Q: Draw the structure of (Z)-2,3-dichloro-4-methyl-2-hexene.
A: For E nomenclature, more prior group are on the opposite side . For Z nomenclature ,more prior gro...
Q: Summarize your understanding about the different sources of energy by filling out the table below. U...
A: We are assigned different sources of energy. We have to find their source, examples, and their advan...
Q: Gaseous butane (CH,(CH,),CH;) reacts with gaseous oxygen gas (0,) to produce gaseous carbon dioxide ...
A:
Q: What is electronegativity?
A: The tendency to attract shared pair of electron is called electronegativity. Fluorine is most elect...
Q: Suppose a 500. mL flask is filled with 0.40 mol of N, and 0.90 mol of NH3. This reaction becomes pos...
A: volume of flask = 500 mL Initial moles of N2 and NH3 are 0.40 and 0.90 moles respectively.
Q: 7a. The structure below is "crack" cocaine, a substance used as a recreational drug. Cocaine acts by...
A: 7a : Given structure is cocaine. cocaine is acid or base and reaction with hydrochloric acid giv...
Q: Write the chemical formula for ammonium oxalate
A: Chemical formula for ammonium oxalate
Q: A compound was discovered whose composition by mass is 85.6% C and 14.4% H. Which of these formulas ...
A:
Q: A sample of polystyrene, which has a specific heat capacity of 1.880 J-g .°c', is put into a calorim...
A: Given data,Specific heat capacity of polystyrene=1.880J.g-1.oC-1Mass of water=250.0gInitial temperat...
Q: 2. What mass of NaCl is needed to prepare 30.0% by mass of 500g solution of NaCl? Solution: 30.0% by...
A:
Q: True or False: 1. The initial concentration of an intermediate is assumed as 0 when using steady-s...
A: In a case where the reactions are investigated under such conditions that the slowest rate-determini...
Q: AROMATIC HYDROCARBONS Properties MULTIPLE RING SYSTEMS White volatile crystals with Moth repelants N...
A: COMPOUND-NAPTHALENE Properties of Naphthalene: The actual properties and substance properties of nap...
Q: 2C2H6(g) + 702(g)→4C02(g) + 6H20(g) Using standard thermodynamic data at 298K, calculate the free en...
A:
Q: The reaction between hydrazine (N,H) and dinitrogen tetroxide (N,O4) in their liquid forms is used t...
A:
Q: I. Both water and carbon dioxide are triatomic molecules with similar formulas. Explain why one of t...
A: Polar molecules: these are the molecules in which one end is slightly positive and the other end is ...
Q: cetylene (C,H,) gas is often used in welding torches because of the very high heat produced when it ...
A: 2C2H2 + 5O2 -------> 4CO2 + 2H2O Number of moles of O2 = 0.095 moles
Q: TRIAL I II Weight of the impure benzoic acid 5.1 5.3 Weight of the watch glass + sublimate 13...
A: For trial 1 Weight of the (watch glass + sublimate) = 133.8 gram For trial 1 Weight of the watch gla...
Q: Calculate the Amax (in EtOH) of the following compound: HO,
A:
Q: 1. How does real-time polymerase chain reaction work? 2. What does the melting point represent?
A: Real-time polymerase chain reaction This is also commonly known as RT PCR. It is a laboratory techni...
Q: A scientist wants to prepare 500 ml of 500 mM formate buffer pH 3.00. The pKa for formic acid, нсоон...
A:
Q: What is electronegativity and what are its periodic trends? What is the general relationship between...
A: Atom is the smallest particle which can not be further divided into any other tiny particle.
Q: State whether true or false and briefly explain a. The reaction: X(l) → Y(g) + Z(g) results to posi...
A: A positive work is said to be done if the work is done on the system to change it or modify it. A ne...
Q: Question 3 Consider the following two molecules. The hydroxyl group in the blue circle is able to fo...
A: To find which hydrogen is more deshielded proton.,
Q: What does a catalyst do? Increases the rate of reaction O a. O b. stabilizes a reaction Increases th...
A: Chemical reaction is a process of conversion of one or more compounds into one or more other compoun...
Q: Calculate the mass of hydrazine (N_2H_4) that contains a billion (1.000 x 10^9) nitrogen atoms. Be s...
A: Given, Number of atoms of N in N2H4 = 1.000 x 109 atoms of N Calculate the mass of N2H4 that conta...
Q: The synthes is of Cocle is an exo the rmic process ? endothermic
A: When 1 mole of CO(g) reacts with Cl2(g) to form COCl2(g) according to the following equation, In thi...
Q: What is the calibration correction of a 10-mL pipet that delivers 9.9300 g of H2O at 19.0°C which is...
A: Volumetric capacity of pipet = 10 mL Weight of water delivered = 9.930 g Temperature = 19 degree cel...
Q: Why is it important to study the structure of crystalline solids? pls answer within 20 mins. thank ...
A: Crystal structures depicts the arrangement of atoms in a material. The lattice parameter bond length...
Q: Sulfur dioxide and oxygen react to form sulfur trioxide, like this: 250,(g)+0,(g) → 2so,(g) Suppose ...
A: Equilibrium reaction : 2SO2(g) + O2(g) ↔2SO3(g) Perturbation :...
Q: CO,H H2N- -H H FOH CH3 CO,H H2N. H H2N- H. A) Н. LOH B) H. CO,H COH ČH3 ČH3
A: Fischer projection formula is represent the eclipsed conformation of a molecule. The conversion of F...
Q: Draw the electrolytic cell diagram for each electrolyte solution given. Showing the migration of ion...
A: A question based on electrochemical cells that is to b accomplished.
Q: The table below shows the energy released when burning 1.0 g of each of the following organic compou...
A: Since you have asked multiple question, we will solve the first question for you.If you want any spe...
Q: to form Ba(IO3)2, 500 mL of 0.5000 M Ba(NO3)2 was mixed with 500 mL of 0.0500 M NaIO3. Ksp= 1.57x10...
A:
Q: Organic chemistry :Name the two compounds attached below
A: The naming of an organic compounds can be done as per rules of international union of pure and appli...
Q: In order to form Ba(103)2, 500 mL of 0.5000 M Ba(NO3)2 was mixed with 500 mL of 0.0500 M NalO3. Ksp=...
A: 500 mL of 0.5000 M Ba(NO3)2 are mixed with 500 mL of 0.0500 M NaIO3 . We have to find out millim...
Q: the amount o
A: Since you have asked multiparts, we will solve the first three subparts for you. If you want any spe...
Q: Describe the properties and what it is made out of for the following: Aluminum foil, Glass jar, B...
A: Answer - Aluminum foil - Aluminum foil, is a paper-thin, shiny sheet of aluminum metal. It's made by...
A solution of Tryptophan has an absorbance at 280 nm of 0.54 in a 0.5 cm length cuvette. Given the absorbance coefficient of trp is 6.4 x 103 Lmol-1cm-1. What is the concentration of solution?
Step by step
Solved in 2 steps with 2 images
- The un-ionized form of the weak acid HA does not absorb in the visible region. When it ionizes, its conjugate base (A-) absorbs light strongly at 510 nm. The following data were obtained by measuring the absorbance at 510 nm of solutions with a concen- tration of 1.0 x 104 M HA in different pH buffers. pH Absorbance 2.0 0.00 3.0 0.00 4.0 0.00 5.0 0.025 6.0 0.180 7.0 0.480 8.0 0.570 9.0 0.595 10.0 0.595 11.0 0.595 12.0 0.595 What is the approximate pK of HA?If a solution of dissolved acid has pH = 2.5 and the pka for the acid chemical is 4.3 and you measure the concentration of the conjugate []-base to be 10mm, what is the concentration of the acid in the solution? pH = pka + logi [HA]Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product that absrobs light at 625 nm, which çan be used for the spectrophotometric determination of ammonia. gan OCF OH + NH3 indophenol anion To determinè the ammonia concentration in a sample of lake water, three samples are prepared. In sample A, 10.0 mL of lake water is mixed with 5 mL of phenol solution and 2 mL of sodium hypochlorite solution, and diluted to 25.0 mL in a volumetric flask. In sample B, 10.0 mL of lake water is mixed with 5 mL of phenol solution, 2 mL of sodium hypochlorite solution, and 2.50 mL of a 5.50 x 10-4 M ammonia solution, and diluted to 25.0 mL. Sample C is a reagent blank. It contains 10.0 mL of distilled water, 5 mL of phenol solution, and 2 mL of sodium hypochlorite solution, diluted to 25.0 mL. The absorbance of the three samples is then measured at 625 nm in a 1.00 cm cuvette. The results are shown in the table. Sample Absorbance (625 nm) A 0.361 B 0.608 C…
- A 1.43 x 10-4 L solution of 45.7 mg/mL protein was analyzed using the Kjeldahl procedure. After digestion of the protein, the liberated NH3 was collected in 9.80 mL of 0235 M HCl. The unreacted acid required 10.75 mL of a standard solution of 0.0149 M NaOH for complete titration. Calculate the weight percent of nitrogen in the protein. (Molar mass N = 14.00674 g/mol)The molar absorptivity constant of a particular chemical is 2.31 M/cm. Determine the concentration of a solution made from this chemical that has an absorbance of 0.408 with a cell path length of 1.12 cm.The table below describes a procedure in preparing standard solutions of a protein sample with different concentrations. (A) Determine the concentrations of each tube if the starting concentration of the protein is 500 mg mL (B) Determine the equation of the line if the concentration (x-axis) was plotted vs the absorbance (y-axis). (C) What is the concentration, in mg mL, of the diluted unknown protein sample if the absorbance at 595 nm is 0.333? L-1. Tube Volume of protein, Volume of water, Final concentration, Absorbance #3 mL mL (at 595 nm) mg mL-1 0.00 5.00 0.113 12 0.70 4.30 0.184 3 1.40 3.60 0.251 14 2.10 2.90 0.329 15 2.80 2.20 0.385 3.50 1.50 0.454 17 4.20 0.80 0.503 8 5.00 0.00 0.577 Suppose that the unknown protein (diluted) sample in 4.C was diluted from a protein stock solution. Determine the concentration of the original unknown protein stock solution if 2.00 mL of the protein solution was mixed with 8.00 mL of water to create the unknown protein (diluted) sample in 4.C.
- In the preparation of the standard curve for protein analysis, 50 mn BSA (bovine serum albumin) dissolved in H2O to a final volume of 5 mL was used as stock solution. What is the weight of BSA in 0.1 mL of stock solution? In 0.2 mL?What is the concentration of a solution with an absorbance of 0.23 a.u. in ppm when y=45.3509y9bii and 11b
- WARIARTAM 2. 1.2589 g of a certain brand of milk powder required 25.89 mL of 0.01873M EDTA to titrate the calcium contained in the sample. (a) What is the percent calcium in the sample? (b) Would the true result be higher, lower, or not be affected if the milk powder sample has been slightly wet?y = 3506.2x + 0.0421 R2 = 0.9978 A student prepared a solution that had 5.00 mL 0.002 M iron(III) nitrate in 1 M nitric acid, 3.00 mL 0.002 M potassium thiocyanate, and 2.00 mL DI water. Using the standard curve above, if the absorbance for the solution was 0.422, calculate the equilibrium constant, Keq.Five white, 500-mg uncoated ascorbic acid (AA) tablets with an average weight of 0.6100-g were pulverized in a mortar. A sample of the powdered ascorbic acid weighing 0.4610-g was placed in an iodine flask and was dissolved in 50-mL H2SO4 then 5-g of KBr was added to the resulting solution. The solution was titrated with 46.73-mL of 0.0152 M STD. KBrO3 to reach a faint yellow endpoint then 3-g KI and 5-mL Starch TS. The blue color solution is then titrated with 2.78-mL of 0.1047 M STD. Na2S2O3 to reach the disappearance of the blue iodostarch complex. MW: KBrO3 = 167.0 ; KIO3 = 214.0 ; Na2S2O3 = 158.11 ; C6H8O6 = 176.12 Compute the milligrams of pure AA per tablet from the assay. None of the choices 349.7 mg 264.3 mg 462.7 mg