Describe the 13C NMR spectrum of 2-methylcyclohexanol.

The reaction between sulfur gas (S₂) and carbon (C) at high temperatures (900C) results in the formation of carbon disulfide (CS₂). The reaction is: C(s) + S₂(g) = CS₂(g). What is the concentration (in moles in reaction chamber) of CS₂(g) at equilibrium if 3.00 moles of S₂(g) and excess carbon are initially added to the 1.00 L reaction chamber? The K_eq for this reaction is 3.50.

Answer the following for the reaction:

Pb(NO3)₂(aq) + 2KCl (aq) ⟶ PbCl₂(s) + 2KNO₃(aq)

a) How many grams of PbCl2 will be formed from 50.0 mL of a 1.50 M KCl solution?

b) How many mL of a 2.00 M Pb(NO3)2 solution will react with 50.0 mL of a 1.50 M KCl solution?

Calculate the pH during the titration of 20.00 mL of 0.1000 M hydrazine, NH2NH2(aq), with 0.2000 M HBr(aq) after 3.5 mL of the acid have been added. Kb of hydrazine = 1.7 x 10-6.

I. Does the solubility of the solute increase or decrease in each of the following situations?

1. Ice is placed in a glass of cola (solute is CO2 gas).

2. Honey is dissolved in hot water instead of cold water.

3. The pressure of O2 over a solution is increased (solute is O2 gas).

II. Which of the following statements about the dilution of a solution are true?

III. In order to prevent the process of either crenation or hemolysis with red blood cells an intervenous solution concentration should be ________ to the concentration of blood.

Solid sodium reacts with water to produce aqueous sodium hydroxide (NaOH) and molecular hydrogen gas. Determine the limiting reactant if 8.21 grams of sodium are reacted with 6.98 grams of water.

In a titration of 40.55 mL of 0.3137 M nitrous acid with 0.3137 M aqueous sodium hydroxide, what is the pH of the solution when 40.55 mL of the base have been added?

Calculate the pH during the titration of 20.00 mL of 0.1000 M C6H5OH(aq) with 0.1000 M NaOH(aq) after 19.9 mL of the base have been added. Ka of phenol = 1.0 x 10-10.

3a. If the molar absorptivity constant for the red dye solution is 5.56×104 M-1 cm-1 , calculate the molarity of the red dye solution with absorption = 0.900. You may assume L = 1.22cm. Hint: A=εLC

b. Convert the molarity in part a to w/v%. Show your work. Molar mass of FD&C red #3 = 879.86g/mol w/v% is defined as weight (in grams) of solute/100 mL of solution You should remember that w/v% always refers to the grams of materials in 100mL of solution. ppm is defined as mg of solute/ L of solution (1mg = 10-3 g) ppb is defined as µg of solute / L of solution (1µg = 10-6 g)

c. If you want to dilute the red dye solution in part a by 5 times in a single dilution step, explain in two sentences on how one should proceed with the dilution. In addition, what is the final concentration of the diluted solution? Show your work for the numerical part of this question. You are only allowed to use a 5-mL volumetric pipet, a 10-mL volumetric pipet, a 50-mL volumetric flask and/or a 100-mL volumetric flask during the dilution. You may NOT reuse the same pipet during the dilution.

(b) Which have a molecular dipole moment? (Select all that apply.)

CF₄

BF₃

PF₃

OF₂

F₂

Experimental Organic Chemistry 1

HPLC Questions

- What's the difference between single point calibrations and five point calibrations?

- How could you improve your resolution on a chromatograph?

- What's the difference between isocratic runs and gradient runs?

Contrast the reaction to form biodiesel with the reaction to form soap. Why do they form different products given that both reactions start out with a base and a fat or oil?

Use Slater's Rules to calculate Z* for

A. 3p electron in the element P

B. 4s electron in Co

C. 3d electron in Mn

Part A MX (Ksp = 3.97×10−36)

S = _____ M

Part B Ag2CrO4 (Ksp = 1.12×10−12) Express your answer in moles per liter.

S = _____ M

Part C Ni(OH)2 (Ksp = 5.48×10−16) Express your answer in moles per liter.

S = _____ M

A 19.57 g mixture of sugar (C12H22O11) and table salt (NaCl) is dissolved in 223 g of water. The freezing point of the solution was measured as -3.85 °C. Calculate the mass percent of sugar in the mixture. A list of Kf values can be found here.