4. A sample of the amino acid cystine has a specific rotation of -68°. Pure (-)-cystine has a specific rotation of -339°. What are the mole percentages of the levorotatory and dextrorotatory enantiomers in the sample? NH₂ OH HO NH₂ cystine
Q: Draw the curved arrows and the products formed in the acid-base reaction of HBr and NH3. Determine…
A: Acid is substance which is electron acceptor and base is substance which is electron donor.
Q: Aluminum metal is produced by heating aluminum oxide, Al₂O3(s), and other substances to almost 1000…
A:
Q: Which of the following is the compound that when hydrolyzed produces these two products? X + H₂O* NH…
A:
Q: Show how each alcohol or diol can be prepared from an alkene. (a) 2-Pentanol (b) 1-Pentanol (c)…
A: Dear student, since the given question is a mutipart question , hence I solved first three questions…
Q: Shown below is an abbreviated spectrochemical series arranged according to decreasing ligand field…
A: According to the crystal field theory, in the presence of the ligand field, the five d-orbitals of…
Q: An endothermic reaction (AHrxn = +125 kJ) has a Kc of 4.61 x 103 at 25.0 °C. What is its equilibrium…
A:
Q: Identify a staggered conformation for 1 viewed along the Ca-Cb bond. CH₂ F -CI HH CH₂CI H. H H H. H…
A: Staggered Conformation: Staggered conformation is the arrangement of atoms or groups of atoms in a…
Q: The total pressure of the system is 12.6 atm. What is the partial pressure of the nitrogen in the…
A:
Q: If the Standard Potential cell for the following AgI /Ag and I/I was - 0.152vand o, suv…
A:
Q: What do you call the high-energy complex that forms from the collision of reactants, and which…
A: Reactant particles collide with each other and a high energy complex formed first of all. ->This…
Q: A 0.678-g sodium carbonate sample with 98.6% purity requires 36.8 mL of sulfuric acid solution to…
A: We can determine molarity by using Molarity = mole of solute/ volume of solvent (in the litter)
Q: 7. In the photochemical decomposition of acetaldehyde by light of wavelength 3100 angstrom, CO is…
A: Here we are required to find the rate of CO formation.
Q: Refer to the chemical equation below and answer the questions that follow: (NH4)2Cr₂O7 → Cr₂O3 + N₂…
A:
Q: 4. Ortho-Dichlorobenzene, C6H4Cl2, is obtained when two of the adjacent hydrogen atoms in benzene…
A: Lewis’s structure: Lewis’s bonding theory is based on the octet rule. The Lewis structure is a…
Q: CHALLENGE 7 A 30 g gas sample of CO₂ occupies 27 L and exerts a pressure of 5.6 atm. Additionally,…
A:
Q: ionises in water to produce benzoate, Benzoic acid, and hydronium, H3O+ ions. The acid ionisation…
A: ->Conjugate base can be formed by donating hydrogen ion by conjugate acid.
Q: 7. 50 g of Vanadium is mixed with 50g of Ozone (03) to produce 65 g Vanadium (V) Oxide a) What is…
A: % yield = (actually mole /theoretical mole) ×100
Q: Calculate the emf, E at 298.15 K for the given reaction: Cr2O7 2 – (aq) + 14 H+ (aq) + 6 I – 1 è 2Cr…
A: here we are required to find the free-energy occurring in the system .
Q: SOD Portal What is the starting compound X that will form 3- heptanol when treated with…
A: Given, When X reaction with butylmagnesium bromide followed by acid work up to produced 3-heptanol…
Q: (a) Sketch the trigonal pyramidal molecule AsCl3 and label its principal rotation axis. (b)…
A: The Principal axis of rotation is C3 which passes through the As atom.
Q: 2. The following data was collected as a solution was prepared. Mass unknown solute (g) Mass solvent…
A:
Q: Consider the following equation: 4NH3(g) + 5 O2(g) → 4 NO(g) + 6 H₂O(1). 25 g of NH3 and 25 g of O2…
A:
Q: The enthalpy of combustion of solid naphthalene (C₁0H8) at 298 K and 1.0 atm was found to be -5134…
A:
Q: Chemistry starting from 5-bromoisatin, 3-methylbenzylbromide, 4-methylbenzylbromide, how to yield…
A: Similarly you can use 4-methylbenzylbromide also
Q: 1. From 17M glacial acetic acid, how would you perform serial dilution to prepare 1.0 M, 0.50 M, and…
A: From 17M Glacial acetic acid solution we want to create 1000 mL of 1.0 M solution. M1V1 = M2V2…
Q: a. b. Br s Ol OH name compounds H
A:
Q: Identify the first-row transition metal M that satisfies the requirements given (more than one…
A: General electronic configuration of first row of d block element is [Ar] 4s2 3d1-10
Q: Below is the concentration versus time graph for the reaction system. The graph was produced using…
A: From the given graph recall the reaction that occur here 2NO2 g↔ N2O4g Recall the…
Q: The system below is at 273 K and the volume of the connecting tube is negligible. The gases can flow…
A:
Q: What is the IUPAC name for each of the following compounds? a.C6H5CH2(CH2)3COOH b. Br(CH2)3COOH D-CH…
A: In this question, we will give the IUPAC name of the given three compounds. You can see the…
Q: Consider the electrolysis of an aqueous solution which is 1.0 M NaCl and 1.0 M NiCl₂. Predict the…
A:
Q: Q3: For a 94.5 wt% Fe-5.5 wt% C at a temperaturel 100 °C, determine the following: a) The Number and…
A:
Q: 1. For each of the following reactions, write down the rate of the reaction in terms of the…
A:
Q: Calculate the pH value when titrated between 25 ml of weak acid HA concentration of 0.3 (104 x 6.6…
A:
Q: PROBLEM SOLVING 1.) Under constant pressure condition, a sample of hydrogen gas initially at 85°C…
A: Here we are final temperature of hydrogen gas
Q: A galvanic cell is set-up in the laboratory with a copper anode and an unidentified cathode. Your…
A:
Q: Please provide a clear solution for the following question: Titanium is reacted with hydrogen…
A: For the same solution with different concentrations , the path length (l) and the molar absorptivity…
Q: Ojos del Salado in Chile is the highest active volcano in the world at 6,893 m above sea level. Near…
A: Corresponding pressure will be = 28.371 kPa
Q: When mixed with water, does KOH (s) behave as a: a) weak acid b) strong acid c) weak base d) strong…
A: Acid can be defined as the species that give hydrogen ions in an aqueous solution. Base can be…
Q: Directions: Balance the following redox reactions using the change in oxidation number method. a.…
A: Oxidation number method is used for the balance of chemical reaction. This method takes care of the…
Q: What is formed when hydrobromic acid, HBr, and calcium hydroxide, Ca(OH)2, are combined
A: Given-> Reactants -> HBr , Ca(OH)2
Q: A copper concentration cell is to be converted to an electrolytic cell to perform copper plating.…
A: In electrolytic cell oxidation is take place at anod while reduction is take place at anode.
Q: If the voltage of Zn-H+ cell is 0.542 V at 25 0 C, What is the concentration of the H+? when : [Zn…
A: Given-> Ecell = 0.542 V T = 25°C = 25 + 273 = 298 K [Zn2+] = 0.01 M [H2] = 1.0 M
Q: Which of the following pairs of solutions would result in a buffer if they were mixed? a) 1.0 M…
A: A buffer solution is a solution that withstands any change in pH upon the addition of small volume…
Q: decreases after the occurrence of a spontaneous change. b. The entropy of any substance at…
A: According to thermodynamics the entropy of substance measure the randomness or disorder of a…
Q: A scuba tank containing air holds 204 atm of gas. If air is 20.9% oxygen, what is the partial…
A:
Q: 18 mm -~ 2 PPM 36 mm 36 mm
A:
Q: Refer to the chemical equation below and answer the questions that follow: (NH4)2Cr2O7 → Cr₂O3 + N₂…
A: #Q.1: For N2(g): Pressure, P = 1.5 atm, Temperature, T = 185 + 273.15 = 458.15 K Volume, V = 1275…
Q: Please describe one regulatory mechanism involved in amino acid synthesis, with an example
A:
Q: Which of the following will produce a buffer solution when mixed? 50.0 mL 0.500 M HNO3 + 50.0 mL…
A: In this question, we will identify the Buffer solution after mixing two substances to each other's.…
Step by step
Solved in 2 steps with 1 images
- If the optical rotation of a pure enantiomer A is +10 and the optical rotation of a mixture of two enantiomers (A+B) is -4 (Negative 6), what is the percentage of A and B in that mixture?2. After an attempt to resolve a racemate into its enantiomers, the observed rotation is +22.4 degrees per g/L. If the known specific rotation is +24.2 degrees per g/L,, what is the % enantiomeric excess of the compound?Consider a mixture that is 60% (+) enantiomer and 40% (-) enantiomer. In which direction will the mixture rotate plane-polarized light? What is the enantiomeric excess of the mixture?
- What is the enantiomeric excess (ee) of a sample of mendalic acid with a specific rotation of +50, when pure (R)-mendelicacid has a specific rotation of -154. What is the composition of the sample in R and S isomers?1. A solution of (S)-2-butanol (molar mass = 74.12) is observed to have a rotation in a 10 cm path length of +16.2 degrees. If the molar specific rotation of (S)-2-butanol is +135.2 degrees, what is the concentration of (S)-2-butanol in grams per liter? 2. After an attempt to resolve a racemate into its enantiomers, the observed rotation is +22.4 degrees per g/L. If the known specific rotation is +24.2 degrees per g/L,, what is the % enantiomeric excess of the compound? 3. If the % enantiomeric excess of a chiral compound is 88.2%, what is its chiral purity?An attempt at synthesizing a certain optically-active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of +11.5°+11.5°. If it is known that the specific rotation of the ?R enantiomer is −38.0°−38.0°, determine the percentage of each isomer in the mixture.
- (-)-Cholesterol has a specific rotation of -32o. A mixture of (+)- and (-)-cholesterol was analyzed by polarimetry, and the observed rotation was 14o. What is the percent composition of the (+) isomer in this mixture?Assume 1 g of sample was dissolved in 1 mL water and the sample cell was 1 dm long.(+)-Tartaric acid has a specific rotation of +12.0°. Calculate the specific rotation of a mixture of 68% (+)@tartaric acid and 32% (-)@tartaric acidDraw all stereoisomers of 3,4-hexanediamine. Label each sterocenter with the appropriate R/S designation to show hardness. Indicate the relationship(enantiomers or diasteromers) between every possible pairing of compounds. Label each compound as chiral or achiral, and if there is a mess compound, label it as such.one of these compound has a specific rotation of +6.9 degrees. Which compound might this be? What do you expect the specific rotation of the remaining compound to be?
- The specific rotation of (S) butanol is +13.5 if 1.00g of its enantiomer is dissolved in 10.0mL of ethanol and placed in a sample cell with a length of 1.00 dm, what observed rotation do you expect?(+)-Mandelic acid has a specific rotation of +158o. What would be the observed rotation of a mixture containing 45% (-)-mandelic acid and 55% (+)-mandelic acid?The absolute value of the specific rotation of an enantiomer 2-butanol is 13.5o. What is the percentage of each enantiomer (R and S) in a mixture that has a specific rotation of -8.5o? The (R)-enantiomer is levorotatory. Be clear and detailed.