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Consider the trioxane equilibria illustrated below (trioxane itself is a hypnotic agent used therapeutically). Use PC Model to compute the 298 K heats of formation of the monomers and the trioxanes in kJ mol1. Find the experimental gas-phase heats of formation (webbook.nist.gov might be a nice resource). How does PC Model do? Assuming the enthalpies are equivalent to free energies (they arent, but lets make the assumption for the moment), what are the equilibrium constants for the two equilibria in the gas phase?
what is the speed of a proton in a linear accelerator has a de Broglie wavelength of 159 rm pm
When heated, ammonium carbonate decomposes as follows. NH4CO2NH2(s) -> 2NH3(g)+CO2(g) At a certain temp, the equilibrium pressure of the system is 0.318 atm. Calculate Kp for the reaction.
Use the Nutritional information on the food bag to calculate the calories per gram? How does this information compare to your information? How do you explain the discrepancy? How could you do the experiment differently to get a more accurate value..
A 58.0 mL solution of 0.500 M Cd(NO3)2 is prepared. What mass of NaOH is needed to precipitate the Cd2+ ions from this solution?
Determine the concentration of the sodium hydroxide solution? Considering this balanced equation given as :
The molar solubility of MnCO3 is 4.2 x 10-6 M. What is Ksp for this compound?
Calculate the molality of a calcium chloride solution prepared by dissolving 69.34 grams of calcium chloride in 638.7 grams of water.
The combustion of one mole of ethanol (C2H5OH(l)) to produce carbon dioxide and gaseous water has ?Hr = -1235 kJ · mol-1 at 298 K. What is the change in internal energy for this reaction?
The half-life of 137Ce is 30. years. If we have 150.000 g of 137Ce now, how many grams of Ce will remain in 150. years?
Given that the Ka of boric acid is 5.8x10^-10M, what is the pH of a 0.50M boric acid solution? Are there any good approximation available?
How many atoms of each element are present in one molecule of the following compounds?
In a manometer the mercury level at the open end of the tube is 215 mm higher than at the closed end of the tube. If the atmospheric pressure is 1 atm.
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