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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?
Calculate the cell potential E for a silver-silver chlroide lectrode immersed in 0.800 M KCl at 25 C.
Calculate the capacity factor for decane on HP-1 column (25 m length, 0.25 mm I.D., 0.5 mkm film thickness) at 120 C. Explain.
Explain the order of elution you would observe while performing gas chromatography during an elimination/dehydration process on 2-butanol. What property of the product molecules seems to be the most important in determining the relative retention ..
A sample of neon gas used in a neon sign occupies a volume of 1.50 L at a pressure of 630 torr. Calculate the volume of the gas if the pressure in the glass tube of the sign is 793 torr.
Determine the enthalpy change for the following reaction below using (a) standard enthalpies of formation, and (b) average bond energies. Explain why the two values might be different.
Calculate the standard cell potential at 25 C for the reaction X(s)+2Y+(aq)?X2+(aq)+2Y(s) where ?H? = -651kJ and S = -371J/K.
The internuclear distances in gas-phase ionic molecules are considerably smaller than those in the corresponding crystals.For exemple,
What is the relative spread (in ppt) of the two values? (Note: ppt is part per thousand. Keep one decimal place in your answer.)
How much of 2,4 hexadien-1-ol would you need to react with 98 mg of maleic anhydride in a Diels-Alder Reaction? (Assume a 1:1 molar ratio of maleic anhydride to 2,4 hexadien-1-ol)
A 1g sample of carbon obtain from material found in a ancient site gave 7900 carbon-14 disentegrations in a 20-hour period. In the same amount of time 1g of carbon from a source found yesterday under went 18,400 disintegrations.
Calculate the formula mass of each compound given below. Keep at least one decimal place in atomic masses from the periodic table.
Enough Al2(SO4)3 solid is added to water to prepare 100.0 mL of a 0.150 M solution of aluminum sulfate. What is the concentration of sulfate ion in solution?
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