Isomerism Questions and Answers

(S)-2-hydroxypropanoic acid (lactic acid) is produced in the fermentation of milk to make yogurt. Some bacteria produce a mixture of stereoisomers and some produce solely the (R)-isomer. (S)-lactic acid. is shown below. Draw the (R)-isomer. Use a dash or wedge bond to indicate stereochemistry of substituents on asymmetric centers, where applicable.

How many moles are present in the 1.20-g sample of copper?

An alcohol is 62.04 % C and 10.43 % H by mass. The rest is oxygen. What is the empirical formula of the alcohol? Enter the elements in the order C, H, and then O.

A solution of two diastereomers contains 77.0% of (3S,4S)-tert- butyl-3-amino-4- hydroxypyrrolidine-1-carboxylate and 23.0% of (3S,4R)-tert-butyl-3- amino-4-hydroxypyrrolidine-1- carboxylate. Calculate the percent diastereomeric excess (%e.e.) of the (3S,4S)-tert-butyl-3-amino-4- hydroxypyrrolidine-1-carboxylate in this solution.

A solution of a chiral compound was prepared by dissolving 15.67 g in 16.00 mL of solvent. The solution was placed in a tube that is 1.00 dm long. What is the specific rotation of light if the observed rotation was determined experimentally to be +62.41°?

A compound having an approximate molar mass of 210.0-215.0 g has the following percentage composition by mass: carbon, 33.80 % hydrogen, 1.428 % nitrogen, 19.72 % oxygen, 45.07 % Determine the empirical and molecular formulas of the compound. (Enter the elements in the order: C, H, N, O.) Empirical formula: Molecular formula:

Which of the following ionic compounds is soluble in water? a (NH4)2S b. Cas c. Cu₂S d. Al2S3 e. MgS

For E-stilbene, draw the products you get if the bromine mechanism is syn addition (addition to the same side) and also draw the products you get if the mechanism is anti addition (addition to opposite sides). nexelloko

(C3H8, 44.1 g/mol) is a common fuel for barbeque grills and camp stoves and is sold in canisters. The combustion reaction of propane is shown in the equation below. In an experiment, 16 ounces of liquid propane was combusted in the presence of excess oxygen, and the resulting carbon dioxide (465.8 g) was captured. What is the percent yield for carbon dioxide in this experiment? (Density of C3H8 is 0.493 g/mL)

Predict the product(s) of the following reaction. How many products are formed? Name the product with the most carbons overall. What is the molecular formula of the product with the most carbons overall (in alphabetical order).

On each chair structure identify the relationship of the substituents as cis or trans? I = trans; II = trans l =cis; 11 = cis I = trans; 11 = cis I=cis; II trans not possible to tell while in a chair structure

At the same temperature what weight of glucose in grams when dissolved in 100 g of water will produce the same lowering of vapour pressure as one gram of urea dissolved in 50 g of water. [Consider solutions to be highly diluted].

Liquid octane (CH₂(CH₂)6CH3) reacts with gaseous oxygen gas (O₂) to produce gaseous carbon dioxide (CO₂) and gaseous water (H₂O). If 102. g of carbon dioxide is produced from the reaction of 78.81 g of octane and 165,6 g of oxygen gas, calculate the percent yield of carbon dioxide. Round your answer to 3 significant figures. and

Alkanes: 1) Draw the skeletal/line formula for octane, cyclopropane, and pentane. 2) Write the molecular formula for octane, cyclopropane, and pentane. 3) Draw as many isomers as you can with the formula C6H12. Name all the structures.

Question 7 (1 point) For this question, Vibranium (Vb) is a fictional metal in group 2 of the Periodic table. Write the formula for Vibranium Nitride Question 8 (1 point) For this question, Adamantium (A) is a fictional transition metal with multiple possible charges. Write the formula for: Adamantium (II) Hyponitrite

Be sure to answer all parts. A sample of helium gas has a volume of 2.0 L at a pressure of 4.0 atm. What is the volume of gas at each of the following pressures? The temperature and the number of gas particles do not change. a. 5.3 atm L b. 11.2 atm

Which one of the following statements about atomic structure is false? An atom is mostly empty space. Almost all of the mass of the atom is concentrated in the nucleus. The protons and neutrons in the nucleus are very tightly packed. The number of protons and neutrons is always the same in the neutral atom. All of these statements are true.

A chemist working on the synthesis of (+)-pilocarpine, an alkaloid used in the treatment of dry mouth and glaucoma, produced a mixture of enantiomers that gave a specific rotation [ɑ]D = +71° Based on the specific rotation of pure enantiomer, calculate the percentage content of (+) and (-) - pilocarpine in the mixture produced by the chemist.

1. Draw a plot of energy vs dihedral angle with two rotations of 60° each about carbons 2 and 3 of butane. Label the axes ( x= ϴ = 0°, 60° and 120° y = Energy) and draw Newman projections at each maxima and minima. 2. What causes the difference in energy between the conformation at 0° and the conformation at 60°? 3. What causes the difference in energy between the conformation at 0° and the conformation at 120°? 4. Take a picture of your butane in the anti conformation (Newman projection) and upload it with the conformational analysis plot.

4. Draw all possible Newman projections for 2,2,3,3-tetramethylbutane, looking down carbons 2 and 3, rotating every 60°. Draw the potential energy diagram and calculate the energy of each conformation using the values below (10 pts).

An evacuated (i.e. empty) vessel is charged with 0.113M of HI (g). The following reaction proceeds to reach equilibrium. 2Hl (g) = H₂ (g) + l₂ (g) The equilibrium constant for this reaction at this temperature is Kc = 0.113. What is the concentration of hydrogen gas in this system at equilibrium?

A VHF television station assigned to channel 19 transmits its signal using radio waves with a frequency of 500.MHz. Calculate the wavelength of the radio waves.

When potassium chlorate and sugar are heated up together, a burst of flame and smoke are produced. Use the following reaction to predict the AS sign. AS will be negative. AS will not change. AS will be positive. C12H22011(s) + 8 KCIO3(s) → 12 CO2(g) + 11 H₂O(g) + 8 KCl (s)

Draw the Two Chair Conformations of 1,4-cis-dihydroxycyclohexane

One isomer of 2-methylbutane could be hexane. True False

How many structural isomers does C5H91 have? (5 carbons, 9 hydrogens and one iodine) 6 7 9 5 8

Heating 4-chlorotoluene and aqueous sodium hydroxide at high pressure followed by addition of aqueous acid forms: (a) two isomeric compounds of formula C7H8O (b) a single compound of formula C7H8O (c) three isomeric compounds of formula C7H8O (d) a single compound of formula C6H6O (e) no new compound(s) is/are formed a b c d e

A reaction consumes 5.0 g of A and 6.0 g of B. How many grams of C and D should be obtained? IA +3B -> 2C+4D Not enough information is given to answer this question. 10 23 11

Magnesium metal can react in the presence of oxygen gas to produce magnesium oxide. A sample of 41.23 g of magnesium metal was reacted with 20.65 g of oxygen gas resulting in the production of 10.66 g of magnesium oxide. What was the percent yield of this reaction? a. 15.6% b. 22.3% c. 100% d. 20.5% e. 19.5%

A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 40.0 °C. What was the pressure in the gas tank then? 0.625 atm 4.44 atm 5.63 atm 40.0 atm 69.5 atm

Draw 1-Ethyl-2-isopropylcyclohexanes both cis and trans in the most stable Chair conformation (ignore Rand S for now) label each substituent as "e for equatorial" or "a for axial". Upload the models (pictures) and the drawings

A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain? (The accepted caloric values for foods are 4.0 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.)

Which of the following alkanes are in the staggered or eclipsed conformation? Match the alkane with the conformation. Drag and drop options on the right-hand side to reorder and match with items on the left. Reordering may cause items on the right-hand side to swap positions. Compound 1) - Staggered Compound 2) - Staggered Compound 3) - Eclipsed Compound 4) - Eclipsed

Write the structural formula for each of the names given. For each functional group: i. Draw the 3D structure (molecular geometry) write all bonds and lone pairs. ii. Indicate the dipole for polar bonds and do vector addition to determine the polarity of the FG (if any). iii. indicate the strongest IMF at the FG. a. 3-methylpentanal b. ethoxyethane c. 2-methylpentanamide d. 4-methypentan-1-ol e. 3-methylpentanoic acid f. Methyl-2-methylpentanoate

How many stereoisomers are possible for CHCl3 provided that the central carbon has a tetrahedral geometry Answer is 1, if you can draw only one stereochemical formula.

Determine whether trans-1,2-dimethylcyclopentane contains a chiral center. How many different substituents do you count at atom #(2)? (To help yourself, draw trans-1,2-dimethylcyclopentane on a piece of papery

For each of the following, write a thermochemical equation that includes an energy term within the equation. (a) The formation of 1 mol of copper(II) chloride from its elements releases 220.1 kJ of energy. (b) The energy absorbed when graphite is converted to diamond is 2.0 kJ/mol of graphite. (c) The decomposition of silver chloride into its elements requires 127.1 kJ/mol of silver chloride.

Draw the structural formula of trans-1,3-dimethylcyclohexane in the chair conformation.

The incorrect statement(s) about the products of the two parallel reactions is/are : The product P is meso (optically inactive) due to internal compensation. The product mixture Q is optically inactive. The product P is cis isomer The product Q is a racemic mixture of two enantionmers

What orbitals are used to form the 10 sigma bonds in propane (CH₂CH₂CH3)? Label each atom with the appropriate hybridization. Drag the appropriate labels to their respective targets. Note: not all labels will be used.

Boat and chair conformer of cyclohexane are free from angle strain but boat is still unstable than the chair form due to the Non-eclipsing interaction Staggered conformer of boat form Flag-pole repulsion Abnormal bond length

What isotope has 18 protons and 22 neutrons? Enter the name of the element followed by a hyphen and the mass number (e.g., uranium-234).

Draw cis-1-tert-butyl-3-ethylcyclohexane in its chair conformation using the templates. Perform a "ring flip" and draw the resulting chair conformation. Circle the more stable chair conformation. You may omit hydrogens if you want

You have (1R, 3S)-3-chlorocyclohexanol. Perform the following: a. Draw the structure with correct stereochemistry b. Draw the enantiomer of the original structure c. Label the most acidic hydrogen

Arrange the following ions in order from smallest to largest ionic radius: As3-, Rb+, Br, Se2-, Sr2+ As3- < Rb+ < Br< Se2- <Sr2+ As3- <Se2-< Br< Rb+ < Sr2+ As3- <Sr2+ < Se2- < Br- < Rb+ Rb+ < Br< Sr2+ < Se2- <As3- Sr2+ < Rb+ < Br < Se2- < As3-