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Molar Mass of Solute Using Freezing Point Depression:
Suppose that you add 26.7 g of an unknown molecular compound to 0.250 kg of benzene, which has a Kf of 5.12 oC/m. With the added solute, you find that there is a freezing point depression of 3.89 oC compared to pure benzene.
What is the molar mass of the unknown compound?
On top of one of the peaks in Rocky Mountain National Park the pressure of the atmosphere is 500. torr. Determine the boiling point of water at this location. The heat of vaporization of water is 40.7 kJ/mol.
Titration of a 360 mg sample of synthesized aspirin with 0.100 M NaOH solution needed 20.30mL. Explain what is the EMM of the sample and what is the % ASA
Thomas Jefferson Snodgrass (Jeff1 found an unlabelled reagent bottle in his -80 oC freezer. The bottle contained a liquid. He found that the compound (compound I) quickiy evaporated when warmed to room temperature. 'H-NMR of the compound showed. o..
What is the pH of a solution formed by dissolving 0.100 mol of an acid with a Ka of 1.750x(10 to the -5th) and 0.200 mol of the sodium salt of the same acid in a total volume of 1.000L
How does the maximum non-expansion work compare with standard conditions? Provide a thermodynamic justification to your answer.
The half-life for a first-order reaction is known to be 680 seconds at a given temperature. What is the rate constant at this temperature
the boiling point of a solution of an electrolyte 122.30 gramsmolar mass 196 gmol dissolved in water 218.2 grams was
A commercial bleach solution contains 3.62 mass % NaOCl in water. Calculate the mole fraction.
A molecule has two amino/ammonium groups with pKas of 8.9 and 10.8, and a carboxyl group with a pKa of 4.1. A biochemist has 100 mL of a 0.1 M solution of this compound at a pH of 8.3. She adds 40 mL of 0.1 M HCl. What is the pH of the resulting s..
Calculate the molar mass and density of dry air at 0 °C and 1.0 atm. Assume ideal behavior and use two significant figures
The following lab requires water free conditions as well as reflux for reaction to be successful. Draw a schematic and label your reaction set up
An acqueous solution of Kl has a freezing point of -1.80 C and an osmotic pressure of 26.0 atm at 25.0C. Assume Kl completely dissociates in water. What is the density of the solution
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