Is the six-membered ring system in benzene particularly stable or unstable? Explain using chemical concepts

How will I find the pI for a non-ionizable amino acid?

The Separation of Three Organic Compounds by Acid, Base Reactions and Liquid, Liquid Extraction.

Okay, so we had solid benzoic acid, ethyl 4- aminobenzoate, and 9-fluorenone all dissolved in diethyl ether. We separated the basic component by adding 3M HCl, we separated the acidic component by adding 3M NaOH. I don't understand what happens here. To isolate the acidic solution, we added 6 M NaOH and used the vacuum to recover the solid. To isolate the basic solution we added 6M HCl. I did an experiment where a 1:1:1 mixture of Benzoic Acid solid (C6H5COOH), ethyl 4-aminobenzoate solid (C9H11NO2), and 9-fluorenone solid (C13H8O) was dissolved with methylene chloride. Then each component was extracted and tested. I need to come up with a proton transfer chemical reaction that represents what happened in each separation. First separation: HCl was added and two layers formed. aqueous layer was extracted and transfer to a clean container and methylene chlotide layer was left aside. NaOH was added dropwise to aqueouse layer extraction and vacuum filtration was used to extract/separate the basic component ethyl 4-aminobenzoate solid (C9H11NO2).

Results &Data:

1)Benzoic acid (Acid)

Table 1: Collected data from Benzoic acid

2) Benzoate (Base)

Table 2: Collected data from Benzoate.

3) 9-Fluorenone (Neutral)

Table 3: Collected data from 9-Fluorenone.

I need to find the theoretical and percent yield of each product, how many mg of each product is present. And also create 4 chemical reactions. Need help, Please help thankyou

Calculate the change in standard-state entropy for the following reaction that results in the formation of glucose:

6 CO2(g) +6 H2O(l) ⟶ 1 C6H12O6(s) + 6 O2(g)

(If applicable, coefficients of one have been included for clarity.)

Express your answer with the appropriate units. Use FOUR significant figures.

1. Complete Table 1 by calculating the volume of 2.0 mg/mL myoglobin, 6.0 M GuHCl, and 0.5 M phosphate buffer needed to make the 15 solutions needed for the experiment.

Describe the procedure you would follow to determine the concentration of Vitamin C in a sample if the volume of DCPIP required to reach the endpoint was more than the 25-mL flask could hold. Note the titration must still be carried out in the flask. Be sure to include any calculations you would need to perform.

Calculate Delta H rxn for the following reaction (watch the significant figures)

2 NOCl (g) --> N2(g) + 02(g) + Cl2(g)

Given the following set of reactions;

1/2 N2(g) + 1/2 02(g) ---> NO(g) Delta H= 90.3KJ
NO(g) + 1/2 Cl2(g) ---> NOCl(g) Delta H = - 38.6 KJ

Chromic acid (H₂CrO₄) is an acid that is used in ceramic glazes and colored glass. The pH of a 0.070 M solution of chromic acid is the same as the pH of a 0.054 M HNO₃ solution. Calculate K_a for chromic acid.

A hydrogen-oxygen fuel cell is used in the space program to generate clean energy. Describe, in detail, the principle and process of electrical energy generation from hydrogen-oxygen fuel cell. Also include in the discussion major advantages and limitations of such fuel cells.

The solutions at the two Pb electrodes of a concentration cell were prepared as follows:

Cell A: A mixture of 1.00 mL of 0.0500 M Pb(NO3)2 with 4.00 mL of 0.0500 M KX (the soluble potassium salt of an unspecified monovalent ion X-). Some PbX2(s) precipitates.

Cell B: 5.00 mL of 0.0500 M Pb(NO3)2.

The cell potential was measured to be 0.05100 V at 25 °C.

1.)By use of the Nernst equation, determine the concentration (M) of Pb2+ in the solution of Cell A.

2.)In Cell A, how many moles of X- have reacted with Pb2+?

3.)What is the concentration (M) of X- in the solution of cell A.

4.) Calculate Ksp of PbX2.

(a) Calculate the standard free-energy change (ΔG°) for the following oxidation-reduction reaction. Cu(s) + Br2(aq) → Cu2+(aq) + 2 Br−(aq)

(b) Calculate the equilibrium constant for this reaction at 298 K.

Describe the preparation of 40 L 0.02 M phosphate buffer, pH 6.9 starting from Solid KH₂PO₄ and K₂HPO₄

What is the minimum mass of ice at 0.0 C that must be added to 1 kg of water to cool the water from 28 C to 12 C? (heat of fusion = 333 J/g, Specific heat capacity of ice = 2.06 J/g K, water = 4.184J/g K)

Determine whether the entropy increases or decreases in the given situations.

a. A vapor that turned to solid
b. A vapor condenses to a liquid
c. A mole of vapor becomes solid
d. A liquid freezes
e. A solute dissolved in a solvent

A rigid stainless steel chamber contains 210 Torr of methane, CH4, and excess oxygen, O2, at 200.0