what would you expect the vapor temperature to be after collecting 5ml of distillate in a mixture containing 10ml of acetone (bp 56C) and 10ml of water (bp 100C) for a fractional distillation? What would the vapor temperature be in a simple distillation?

Dinitrogen pentoxide (N2O5) decomposes in chloroform as a solvent to yield NO2 and O2. The decomposition is first order with a rate constant at 45 ∘C of 1.0×10−5s−1.

Calculate the partial pressure, in atm, of O2 produced from 1.15 L of 0.592 M N2O5 solution at 45 ∘C over a period of 24.3 h if the gas is collected in a 12.1-L container. (Assume that the products do not dissolve in chloroform.)

As a technician in a large pharmaceutical research firm, you need to produce 400. mL of 1.00 M a phosphate buffer solution of pH = 7.36. The pKa of H2PO4− is 7.21. You have 2.00 L of 1.00 M KH2PO4 solution and 1.50 L of 1.00 M K2HPO4 solution, as well as a carboy of pure distilled H2O. How much 1.00 M KH2PO4 will you need to make this solution?

Can an alkene have the same formula as a cycloalkane? Explain.

All amino acids have a carboxylic group and amino group. Why is it impractical to try and determine the pKa of the carboxylic group?

Calculate the pressure exerted by 2.64 moles of CO₂ confined in a volume of 4.09 L at 454 K. What pressure is predicted by the ideal gas equation? The van der Waals constants for CO₂ are a = 3.59 atm · L²/mol² and b = 0.0427 L/mol.

van der Waals equation:


Ideal gas equation:

What is the function of bile salts in digestion?

Which of the following redox reactions do you expect to occur spontaneously in the reverse direction? (Hint: The reactions are occurring under standard conditions (1 M for the aqueous ions).)

Check all that apply.

Calculate the pH for the titration of 40.00ml of 0.1000M solution of ethylamine (C2H5NH2) with 0.1000M HCl for the following volumes of added HCl: Kb for ethylamine = 6.4X10-4

Volumes; 0.00ml; 20.00ml; 40.00ml and 50.00ml

Fundamentals Of Analytical Chemistry 9th Edition - Skoog

Balance the net ionic equation of the following redox reaction using half-reaction method. Show the steps.

Cr(OH)₃ + ClO₃^- --------> CrO₄^2- + Cl^- (basic medium)

Define the equivalence point of an acid-base titration. Describe it for a weak acid-strong base titration (will the pH be >,<, or = 7).

Enter your answer in the provided box.

At a certain temperature and total pressure of 1.2 atm, the partial pressures of an equilibrium mixture for: 2A (g) <---> B (g))

are Pa = 0.60 atm and Pb= 0.60 atm. After a disturbance, the system regains the equilibrium with a total pressure of 1.7 atm. What is the partial pressure of A at the new equilibrium?

=_____ atm

The chemical transformation and its effect on compound solubility form the basis of Acid and base extraction experiment and the general technique of acid separations by solvent extraction.

a) Comment on the relative solubilities of the organic reactant and product in the diethyl ether

phase vs the aqueous phase.

b) Explain why the solubility properties of the organic starting material change upon

conversion to the product. Please be specific in your explanation (hint: your explanation

should focus on polarity and intermolecular forces).

A 1.90 mol sample of N₂ gas is confined in a 45.9 liter container at 21.5 °C.

If the amount of gas is decreased to 0.950 mol, holding the volume and temperature constant, the pressure will decreasebecause:

Choose all that apply.

With fewer molecules in the container, the molecules have lower average speeds.

With fewer molecules per unit volume, the molecules hit the walls of the container less often.

With lower average speeds, on average the molecules hit the walls of the container with less force.

As the average speed increases, the number of molecule-wall collisions decreases.

None of the Above

A 1.52 mol sample of Xe gas is confined in a 37.8 liter container at 29.7 °C.

If 1.52 mol of He gas is added holding the volume and temperature constant, the average molecular speed of the total system will

not enough information to answer the question

remain the same

decrease

increase

A mixture of methane and carbon dioxide gases, at a total pressure of 950 mm Hg, contains 3.04 grams of methane and5.24 grams of carbon dioxide. What is the partial pressure of each gas in the mixture?

P_CH4 =  mm Hg
P_CO2 =  mm Hg

A mixture of carbon dioxide and xenon gases contains carbon dioxide at a partial pressure of 428 mm Hg and xenon at a partial pressure of 560 mm Hg. What is the mole fraction of each gas in the mixture?

X_CO2 =
X_Xe =

A mixture of methane and carbon dioxide gases, in a 6.92 L flask at 69 °C, contains 4.57 grams of methane and 7.87grams of carbon dioxide. The partial pressure of carbon dioxide in the flask is  atm and the total pressure in the flask is  atm.

A mixture of carbon dioxide and xenon gases is maintained in a 8.28 L flask at a pressure of 4.00 atm and a temperature of 65 °C. If the gas mixture contains 22.8 grams of carbon dioxide, the number of grams of xenon in the mixture is  g.

Barium has a density of 3.59 g/cm3 and crystallizes with the body-centered cubic unit cell. Calculate the radius of the barium ion.